DEV Community: Mohi Moha

Why Do Phone Batteries Discharge Faster in Freezing Temperatures?

Mohi Moha — Sat, 26 Sep 2026 21:14:32 +0000

You step outside on a freezing day, the battery shows 40%, and a few minutes later the phone shuts down. Bring it back indoors and suddenly it shows 30% again. Cold doesn't destroy the charge; it temporarily makes the battery unable to deliver it.

What cold does to lithium-ion batteries

A lithium-ion battery works by moving lithium ions through a liquid electrolyte between the anode and cathode. In the cold:

The electrolyte becomes thicker, slowing ion movement.
Internal resistance rises, so the battery can't supply power as easily.
Voltage drops under load, especially during demanding tasks (camera, GPS, 5G).

The phone's power management sees the voltage fall and may think the battery is empty. To protect itself, it shuts down.

Why the percentage jumps around

The fuel gauge estimates charge partly from voltage. When cold lowers the voltage, the percentage drops quickly. Once the phone warms up, voltage recovers and the percentage comes back. The energy wasn't lost, it just couldn't be delivered.

Temperature ranges

Most phones are designed for:

Operating: about 0°C to 35°C (32°F to 95°F)
Storage: roughly -20°C to 45°C

Below 0°C, performance drops; far below, shutdowns become common.

Photo by 虎曼 on Pexels

Don't charge a frozen phone

Charging below about 0°C can cause lithium plating, where metallic lithium deposits on the anode. That permanently reduces capacity and can create internal defects. Most phones block or slow charging in the cold, but let the phone warm to room temperature before charging.

Tips for cold weather

Keep the phone in an inside pocket close to your body.
Carry a power bank in a warm pocket too.
Use Battery saver and lower brightness outdoors.
Minimise heavy tasks (video recording, GPS navigation) in extreme cold.
Use a case for insulation, and consider an insulated pouch for skiing or hiking.
Warm up gradually indoors to avoid condensation; don't use heaters or hair dryers.
For winter sports, keep a smartwatch or radio as a backup.

Does cold permanently damage batteries?

Occasional cold exposure causes temporary drain. Repeated deep cold cycles, and charging while cold, can contribute to permanent wear. Heat is generally more damaging long term, but both extremes matter.

Video explanation

Summary

Cold thickens the battery's electrolyte, raises resistance and lowers voltage, causing fast percentage drops and shutdowns. Keep the phone warm, carry a power bank, and never charge a frozen phone.

For winter adventures, a phone with a big battery helps. Compare models on infozme's best battery life phones.

Cover photo by Ali Durmuş Cevlan on Pexels. This article was written with the help of AI.

Best Portable Power Banks for Fast Charging Smartphones on the Go

Mohi Moha — Sat, 26 Sep 2026 21:01:47 +0000

A good power bank keeps your phone alive through long travel days, festivals and power cuts. But capacity numbers are misleading, and many power banks charge phones slowly because they don't support the right fast-charging standard. Here's how to pick one that genuinely delivers.

1. Capacity: what the mAh really means

Power banks list capacity at the internal battery voltage (about 3.7V), but phones charge at higher voltages through conversion, losing energy. Real usable capacity is typically 60–70% of the rated number.

Rated capacity	Real phone charges (5,000mAh phone)
5,000mAh	~0.6–0.7
10,000mAh	~1.2–1.5
20,000mAh	~2.5–3

Watt-hours (Wh) are a clearer measure: 10,000mAh ≈ 37Wh.

2. Fast charging standards

To fast charge, the power bank must speak your phone's language:

USB Power Delivery (PD): iPhone, Pixel and most modern Android phones
PPS (Programmable Power Supply): needed for Samsung Super Fast Charging (25W/45W)
Quick Charge: older Android phones
Proprietary (SUPERVOOC, HyperCharge): usually only works at full speed with brand power banks

Look for "USB-C PD 3.0 with PPS" for the widest compatibility.

3. Output wattage

20–30W: fast enough for iPhones and most phones
45W: Samsung Ultra super fast charging, tablets
65–140W: laptops too

Check per-port output; total wattage is shared when multiple devices charge.

Photo by Lukas Blazek on Pexels

4. Useful features

Pass-through charging: charge the power bank and phone at the same time
Built-in cables (USB-C or Lightning), so you never forget a cable
Magnetic (MagSafe / Qi2) wireless packs: convenient but slower and less efficient
Display showing percentage and output wattage
Recharge speed: fast input (30W+) refills big power banks quicker

5. Size and weight

5,000–10,000mAh: pocketable daily carry
20,000mAh: travel, weekends
25,000mAh+: laptop users, heavier

6. Airline rules

Most airlines allow power banks under 100Wh (about 27,000mAh) in carry-on only, never checked luggage. Some airlines now restrict use during flights. Check your airline's current rules.

7. Safety

Buy from reputable brands with certifications (CE, UL, etc.).
Avoid ultra-cheap "50,000mAh" claims.
Don't use power banks that are swollen, hot or damaged.
Store at around 50% charge for long periods.

Video buying guide

Summary

Choose a power bank with USB-C PD + PPS, enough per-port wattage for your phone, realistic capacity for your needs, and a trusted brand. You'll get genuinely fast top-ups wherever you are.

Pair it with a phone that charges quickly. Compare models on infozme's fast charging phones list.

Cover photo by Andrey Matveev on Pexels. This article was written with the help of AI.

Why Does Your Phone Vibrate Randomly? Phantom Vibration and Notification Bugs

Mohi Moha — Sat, 26 Sep 2026 20:49:12 +0000

Your phone buzzes, you check it, and there's nothing there. Or you feel a vibration in your pocket that never happened. Random vibrations come from two very different sources: real vibrations with no visible cause, and phantom vibrations your brain invents. Here's how to tell them apart and fix the real ones.

Real vibrations with no visible notification

1. Silent or hidden notifications

Some apps vibrate but don't show a visible notification, or the notification disappears quickly (e.g., a message read on another device, or an app updating a notification).

Check notification history:

Android: Settings → Notifications → Notification history (turn it on). Next time it buzzes, check what arrived.
iPhone: swipe down to Notification Centre and check recent items.

2. Apps that vibrate on events

Battery or charging notifications (plugging in, reaching full, low battery)
Connection changes (Bluetooth device connecting/disconnecting, e.g., a smartwatch)
Delivery and ride apps with live updates
Games and fitness trackers

3. System events

Emergency or government alerts (sometimes silent test alerts)
Wireless emergency alert tests
Software update notifications

4. Settings that add vibrations

Android: Vibrate for calls, touch feedback, keyboard vibration, charging vibration (Settings → Sound & vibration).
iPhone: System Haptics and Vibration in Accessibility → Touch.

Photo by John (Giannis) Tekeridis on Pexels

Bugs and glitches

Stuck notifications repeatedly updating
A faulty app repeatedly triggering alerts. Check battery and notification usage for suspicious apps
Haptic motor glitches after updates; a restart often fixes it

Fixes step by step

Enable notification history and identify the culprit.
Turn off vibration for non-essential apps (Settings → Apps → Notifications → turn off Vibration per category).
Check connected devices: smartwatches and earbuds often trigger vibrations when connecting.
Restart and update the phone.
Safe Mode (Android): if vibrations stop, a third-party app is responsible.
Reset all settings (iPhone) or app preferences (Android) if the source remains unknown.

Phantom vibration syndrome

If you feel vibrations when the phone didn't vibrate, or when it isn't even in your pocket, you're experiencing phantom vibration syndrome, which is extremely common. Your brain becomes hyper-alert to expected notifications and misreads small sensations (clothing movement, muscle twitches) as buzzes.

What helps:

Reduce vibration notifications (use sound or silent for non-urgent apps).
Carry the phone in a different pocket or bag.
Use Focus / Do Not Disturb periods to reduce anticipation.

Video fixes

Summary

Turn on notification history to catch mystery buzzes, disable vibrations for non-essential apps and events, and check connected devices. If you feel vibrations that never happened, it's phantom vibration, and fewer buzzes help.

Compare phones with refined haptics on infozme's top-rated phones.

Cover photo by John (Giannis) Tekeridis on Pexels. This article was written with the help of AI.

How to Block Spam Calls and Unwanted SMS on Android and iOS

Mohi Moha — Sat, 26 Sep 2026 20:38:27 +0000

Spam calls and scam texts are more than annoying. Many are phishing attempts designed to steal banking details or install malware. Fortunately, modern phones and carriers include strong tools to filter most of them automatically.

Android: built-in protection

Caller ID & spam protection (Google Phone app)

Open the Phone app → three dots → Settings → Caller ID & spam.
Turn on See caller & spam ID and Filter spam calls.

Suspected spam calls go straight to voicemail without ringing.

Call Screen (Pixel and some other phones)

Settings → Spam and Call Screen → Call Screen. Set unknown numbers to be screened automatically. The assistant answers, asks the caller who they are, and shows you a live transcript.

Samsung

Phone app → three dots → Settings → Caller ID and spam protection (powered by Hiya). Choose to block high-risk calls.

Block individual numbers

Open recent calls → tap the number → Block / report spam.

Filter spam texts

Google Messages: Settings → Spam protection → on.
Samsung Messages: Settings → Block numbers and spam.

iPhone: built-in protection

Silence Unknown Callers

Settings → Phone → Silence Unknown Callers. Calls from numbers not in your contacts, recent outgoing calls or Siri suggestions go to voicemail silently.

Call Screening (newer iOS)

Settings → Apps → Phone → Screen Unknown Callers asks unknown callers for their name and reason before your phone rings.

Filter texts

Settings → Apps → Messages → Unknown & Spam → Filter Unknown Senders. Messages from unknown numbers go into a separate list without notifications.

Block a number

Recents → tap the ⓘ → Block this Caller.

Photo by Lê Minh on Pexels

Carrier tools

Most carriers offer free spam blocking apps or network-level filtering (for example, spam alerts, call blocking and "scam likely" labels). Check your carrier's app or website. Many can block international spoofed numbers at the network level.

Third-party apps (use carefully)

Apps like Truecaller, Hiya or RoboKiller can identify more spam, but some upload your contacts or collect lots of data. Read permissions carefully, and prefer built-in tools where possible.

Golden rules against scams

Never share OTP codes, passwords or card numbers with callers, even if they claim to be your bank.
Don't click links in unexpected texts about parcels, taxes or prizes.
Hang up and call back using the official number on the company's website.
Report spam in your phone app. It trains filters for everyone.

Watch the settings

Summary

Turn on spam filtering in your Phone and Messages apps, use Call Screen or Silence Unknown Callers, add your carrier's protection, and never share codes with callers. Together they stop the vast majority of spam and scam attempts.

Newer phones often include smarter call screening. Compare current models on infozme's top-rated phones.

Cover photo by Moose Photos on Pexels. This article was written with the help of AI.

How to Prevent Overcharging and Manage Smart Battery Protection Features

Mohi Moha — Sat, 26 Sep 2026 20:13:09 +0000

Modern phones don't truly "overcharge". Charging stops at 100%. But sitting at 100%, especially while warm, speeds up battery ageing. That's why manufacturers now include smart battery protection features. They're easy to miss in settings, so here's how to find and use them on each major brand.

The main types of protection

Charge limit: stops charging at 80–95%
Adaptive / optimised charging: holds around 80% overnight, finishes before you wake
Bypass / pass-through charging: powers the phone directly while gaming, reducing battery heat
Thermal management: slows charging when hot
Battery health reporting: shows capacity or health status

Samsung Galaxy

Settings → Battery → Battery protection:

Basic: charges to 100%, then stops until it drops to 95%
Adaptive: holds at 80% during sleep
Maximum: limits charging to 80% (newer One UI allows 80–95%)

Pause USB Power Delivery in Game Booster enables bypass charging on supported models.

Google Pixel

Settings → Battery → Adaptive charging: reaches 100% just before your alarm.
Charging optimisation (newer Pixels): limit to 80%.
Battery health (newer models): Settings → Battery → Battery health.

Photo by DEBRAJ ROY on Pexels

iPhone

Settings → Battery → Charging: Optimised Battery Charging, or set a limit (80%, 85%, 90%, 95% on newer models).
Battery Health: Maximum Capacity and cycle count on recent models.

Xiaomi / POCO / Redmi

Settings → Battery → More battery settings → Optimised charging / Smart charging.
Some models offer 80% charge protection and bypass charging in Game Turbo.

OnePlus / OPPO / Realme

Settings → Battery → Advanced settings → Optimised charging / Smart charging.
Some models include Battery health engine and bypass charging for gaming.

When to turn protection off

Before long trips or days when you need every percentage point
If your routine is irregular and adaptive charging leaves you short in the morning

Other habits that protect batteries

Avoid heat: no charging under pillows or in hot cars.
Use quality chargers and cables.
Don't let the phone sit at 0% for long periods.
Store unused phones around 50%.

Video guide

Summary

Turn on your phone's charge limit or adaptive charging, use bypass charging for gaming if available, and keep the phone cool. These built-in tools do most of the work of keeping your battery healthy for years.

Compare phones with advanced battery features on infozme's best battery life phones.

Cover photo by Markus Winkler on Pexels. This article was written with the help of AI.

Why Are Phone Manufacturers Removing the Headphone Jack and MicroSD Slot?

Mohi Moha — Sat, 26 Sep 2026 19:55:51 +0000

Not long ago, every phone had a 3.5mm headphone jack and most Android phones had a microSD card slot. Today, both are rare on flagships and increasingly missing from mid-range phones. Manufacturers give technical reasons, critics point to business motives, and the truth is a mix of both.

Why the headphone jack disappeared

1. Internal space

The jack and its surrounding module take up surprising depth inside a thin phone. Removing it frees room for bigger batteries, haptic motors, larger camera modules and speakers.

2. Water and dust resistance

Every opening is a weak point. Fewer ports make IP68 sealing easier and cheaper.

3. Thinner designs

A 3.5mm jack sets a minimum thickness at the phone's edge.

4. The wireless audio business

Wireless earbuds became a huge, profitable accessory category. Removing the jack pushed many people towards them.

5. USB-C audio

Audio can go through the USB-C port with a DAC (digital-to-analogue converter) dongle, so manufacturers argue the jack is redundant.

Why microSD slots disappeared

1. Speed

Internal UFS storage is many times faster than microSD. Apps installed on cards run slowly, and slow cards can cause camera lag with 4K video.

2. Security and encryption

Modern file-based encryption and app sandboxing work more cleanly with internal storage.

3. Space and sealing

Like the jack, the slot uses space and adds an opening.

4. Cloud services and storage tiers

Selling higher storage models and cloud subscriptions is profitable. Without a slot, buyers pay more for 256GB/512GB versions or cloud plans.

Photo by Karolina Grabowska www.kaboompics.com on Pexels

Which phones still have them?

Headphone jack: common on budget and mid-range phones (many Samsung Galaxy A, Motorola Moto G, Xiaomi Redmi, Realme, Sony Xperia models).
microSD: mostly budget/mid-range Android, rugged phones, and some Sony models.

Always check the spec sheet. Some mid-range models have one but not the other.

Workarounds

Missing	Workaround
Headphone jack	USB-C to 3.5mm DAC dongle, USB-C earphones, wireless earbuds
microSD	Buy a higher storage tier, cloud storage, USB-C flash drive, portable SSD

Tip: a good USB-C DAC dongle can actually sound better than many built-in jacks.

Video explanation

Summary

Manufacturers removed jacks and slots for space, water resistance, speed and design, and it also nudges buyers toward wireless audio, bigger storage models and cloud plans. If they matter to you, choose from mid-range and budget lines that still include them.

Compare current phones with the features you need on infozme's latest mobiles page.

Cover photo by Mihis Alex on Pexels. This article was written with the help of AI.

How to Clear Cache Partition from Android Recovery Mode

Mohi Moha — Sat, 26 Sep 2026 19:41:10 +0000

When an Android phone becomes laggy, drains battery after an update, or apps crash for no clear reason, one of the safest deep-cleaning steps is wiping the cache partition. It clears temporary system files without touching your photos, apps or accounts.

What is the cache partition?

Android stores temporary system data (update leftovers, pre-compiled code, and other short-term files) in a separate cache partition. Over time, especially after major updates, stale or corrupted files there can cause:

Lag and stutter
Battery drain after updates
App crashes or boot slowness
Odd system glitches

Wiping it removes those temporary files. Android rebuilds what it needs automatically.

What it does NOT delete

Photos, videos, documents
Apps and app data
Accounts, messages, contacts
Settings

It's not a factory reset. (Do not choose "Wipe data/factory reset" by mistake.)

Does every phone have it?

Newer phones with A/B (seamless) updates, including Google Pixels and some others, no longer have a separate cache partition option. Samsung, Motorola and many others still offer it. If you don't see the option, it's not available on your model.

Photo by Click Jeth on Pexels

How to wipe the cache partition on Samsung

Power off the phone.
On many recent Samsungs, connect the phone to a computer or charger with a USB cable (required to enter recovery on some models).
Press and hold Volume Up + Side (Power) until the Samsung logo appears, then release.
In Android Recovery, use the volume keys to highlight Wipe cache partition.
Press the Side button to select, then choose Yes.
Select Reboot system now.

The first boot may take a little longer.

Motorola and other brands

Motorola: power off, hold Volume Down + Power, choose Recovery mode, then at the "No command" screen hold Power and tap Volume Up to show the menu → Wipe cache partition.
Other brands: usually Volume Up + Power or Volume Down + Power. Check your model's support page.

Commands via ADB (alternative)

From a computer with ADB set up:

adb reboot recovery

Then use the volume keys as above.

When to use it

After a major Android update if the phone feels slower or drains faster
When several apps misbehave after an update
Before resorting to a factory reset

Video walkthrough

Summary

Wiping the cache partition is a safe, data-preserving fix for post-update lag and glitches on phones that support it. Enter recovery mode, choose Wipe cache partition, confirm, and reboot.

If your phone still struggles after cleanup, compare faster options on infozme's most RAM phones list.

Cover photo by Kelvin Valerio on Pexels. This article was written with the help of AI.

How to Fix "SIM Card Not Detected" Error on Mobile Devices

Mohi Moha — Sat, 26 Sep 2026 19:23:14 +0000

"No SIM card", "SIM not detected" or "Invalid SIM" can appear suddenly, and without a SIM you have no calls, texts or mobile data. The cause can be as simple as a dusty tray or as serious as a carrier lock or damaged reader. Work through these fixes in order.

1. Restart the phone

A restart forces the modem to re-read the SIM. It fixes more cases than you'd expect.

2. Toggle Airplane mode

Turn Airplane mode on for 15 seconds, then off. This resets the mobile radio.

3. Reseat the SIM card

Power off the phone.
Eject the SIM tray with the ejector tool.
Check the SIM for scratches, dirt or bending.
Wipe the gold contacts gently with a dry microfibre cloth.
Make sure the SIM sits flat and correctly oriented in the tray.
Reinsert fully and power on.

Avoid DIY-cut SIMs (e.g., trimmed nano SIMs); poorly cut edges often cause detection issues.

4. Test the SIM in another phone (and another SIM in yours)

SIM fails in another phone too: the SIM is faulty or deactivated. Ask your carrier for a replacement.
Another SIM works in your phone: the issue is your SIM or account.
No SIM works in your phone: likely a phone setting, lock or hardware issue.

5. Check SIM settings

Android: Settings → Network & internet → SIMs → make sure the SIM is turned on (dual-SIM phones can disable a slot).

iPhone: Settings → Mobile Data (Cellular) → check the line is on and labelled correctly.

6. Update software and carrier settings

Install system updates.
iPhone: Settings → General → About. A carrier settings update prompt may appear.

Photo by Andrey Matveev on Pexels

7. Reset network settings

Android: Settings → System → Reset options → Reset Wi-Fi, mobile & Bluetooth.
iPhone: Settings → General → Transfer or Reset → Reset → Reset Network Settings.

This clears APN and network settings without deleting personal data.

8. Check for a carrier lock

If a new carrier's SIM shows "Invalid SIM" or "SIM not supported", your phone may be carrier-locked. Contact the original carrier for an unlock (usually free once the contract is paid).

9. eSIM phones

On eSIM-only or dual phones, make sure the eSIM profile is active and not deleted. If you changed phones, you may need a new eSIM transfer or QR code from the carrier.

10. Hardware problems

Signs of a hardware fault:

No SIM is detected at all, even new ones
Problem started after a drop or water exposure
The SIM tray is bent or loose

A repair shop can test the SIM reader or signal board. Check warranty first.

Quick checklist

Step	Fixes
Restart / Airplane mode	Temporary modem glitches
Reseat and clean SIM	Poor contact
Swap SIMs	Identifies SIM vs phone
Network reset	Corrupt network settings
Carrier unlock	"Invalid SIM" after switching
Repair	Damaged reader

Video fixes

Summary

Restart, reseat and clean the SIM, test it in another phone, reset network settings, and check for carrier locks. Most "SIM not detected" errors are fixed before you need a repair.

Switching carriers often? Choose an unlocked phone with eSIM support. See infozme's latest mobiles page.

Cover photo by Andrey Matveev on Pexels. This article was written with the help of AI.

Understanding RAW Photo Capture on Mobile: DNG Formats Explained

Mohi Moha — Sat, 26 Sep 2026 19:04:43 +0000

Most phone photos are saved as JPEG or HEIC: finished images with processing "baked in". RAW capture saves far more of the original sensor data, giving you room to fix exposure, colour and detail afterwards. On phones, RAW is usually stored as a DNG (Digital Negative) file.

If you've ever wanted more control over your phone photos, RAW is where to start.

What is a RAW file?

A RAW file holds the sensor's data with minimal processing:

More colour depth: typically 10–14 bits per channel vs 8 bits in JPEG
More dynamic range: recover highlights and shadows
Adjustable white balance without quality loss
No heavy sharpening or noise reduction applied (or much less)

DNG is an open RAW format created by Adobe and used by Android and Apple, so it opens in most editors.

"True RAW" vs computational RAW

Phones complicate things because their magic comes from combining multiple frames.

Type	What it is	Examples
Single-frame RAW	One exposure, minimal processing, noisier	Pro/Manual mode RAW on many Android phones
Computational RAW	Multi-frame merged, then saved as DNG	Apple ProRAW, Samsung Expert RAW, Pixel RAW

Computational RAW keeps the noise benefits of stacking while leaving tone, sharpening and colour largely up to you. It's the best of both worlds for most people.

Which phones support RAW?

iPhone Pro models: Apple ProRAW (Settings → Camera → Formats → ProRAW).
Samsung Galaxy S and Z series: Expert RAW app, plus RAW in Pro mode.
Google Pixel: Settings → Advanced → RAW + JPEG control.
Most Android flagships and many mid-rangers: RAW in Pro/Manual mode.

Photo by Jakub Zerdzicki on Pexels

When should you shoot RAW?

Shoot RAW for:

High-contrast scenes (sunsets, backlit subjects)
Landscapes you want to edit carefully
Tricky mixed lighting (white balance)
Photos you plan to print or edit seriously

Stick to JPEG/HEIC for:

Quick snaps and social media
Fast-moving subjects (RAW can be slower)
Saving storage: RAW files are 10–75MB each

A simple editing workflow

Shoot in RAW + JPEG (if your phone offers both) so you have a ready-to-share copy.
Open the DNG in Lightroom Mobile or Snapseed.
Adjust exposure, then highlights down and shadows up.
Set white balance (temperature and tint).
Add texture/clarity and light sharpening.
Apply noise reduction gently, especially for night shots.
Export as high-quality JPEG.

Storage tips

RAW fills storage fast. Use cloud backup or move files to a computer regularly.
On iPhone, choose ProRAW 12MP for smaller files, 48MP only when needed.

Video tutorial

Conclusion

RAW and DNG give you control that JPEG can't: better highlights, cleaner shadows and accurate colour. Computational RAW modes make it practical on phones without losing multi-frame quality.

If mobile photography is your passion, compare phones with strong RAW support on infozme's best camera phones list.

Cover photo by Jakub Zerdzicki on Pexels. This article was written with the help of AI.

How to Use Offline GPS Navigation Maps on Your Smartphone

Mohi Moha — Sat, 26 Sep 2026 18:44:49 +0000

GPS works without the internet. Your phone's GPS chip listens to satellites directly, so it always knows where you are. What needs data is the map itself. Download the map in advance and you can navigate in the mountains, abroad without roaming, or in areas with patchy coverage.

How offline navigation works

GPS/GNSS positioning: satellites (GPS, GLONASS, Galileo, BeiDou) give your location for free, no data needed.
Offline map data: roads, place names and routing information stored on your phone.
Offline routing: some apps calculate routes without the internet; others need data for live traffic and rerouting.

Google Maps offline

Open Google Maps and tap your profile picture → Offline maps.
Tap Select your own map and drag the box over the area you need.
Tap Download. Large areas can take several hundred MB.
Turn on Auto-update offline maps and Download over Wi-Fi only.

Offline capabilities: driving directions and search within the downloaded area. Walking, cycling and transit directions are more limited offline, and live traffic isn't available.

Apple Maps offline (iPhone)

Open Apple Maps → tap your profile → Offline Maps.
Tap Download New Map, adjust the area, then Download.

Offline Apple Maps supports driving, walking, cycling and transit directions, plus place details such as opening hours, within the downloaded area.

Organic Maps and OsmAnd (fully offline, OpenStreetMap)

These apps are built for offline use from the ground up:

Organic Maps: clean, fast, privacy-friendly, no ads or tracking. Great for hiking trails and cities.
OsmAnd: extremely detailed, with contour lines, hiking routes and many plug-ins. Powerful but more complex.

Download countries or regions once, and you get full turn-by-turn navigation without any connection.

HERE WeGo

Offers offline maps for entire countries with voice navigation, and is popular for international road trips.

Photo by William Hadley on Pexels

Offline navigation checklist before a trip

Download maps on Wi-Fi before you leave.
Check storage space; country maps can be 200MB–2GB.
Turn on Location → Improve accuracy (Wi-Fi/Bluetooth scanning helps even without internet).
Carry a power bank, because GPS navigation with the screen on drains battery.
Save key places (hotel, airport, trailhead) as favourites.

Improve GPS accuracy offline

Get a clear view of the sky; tall buildings and dense forest reduce accuracy.
Phones with dual-frequency GPS (L1+L5) are much more accurate in cities.
Calibrate the compass (figure-eight motion) if the direction arrow drifts.
Keep the app open for a minute at the start so it gets a solid fix.

Save battery while navigating

Use dark mode and lower screen brightness.
Turn on Airplane mode and then re-enable Location only. GPS still works.
Use voice guidance with the screen off.

Video walkthrough

Summary

GPS never needs data; maps do. Download them ahead of time in Google Maps or Apple Maps for everyday travel, or use Organic Maps and OsmAnd for fully offline adventures.

For the most accurate navigation, look for phones with dual-frequency GPS and big batteries. Compare models on infozme's best battery life phones.

Cover photo by Ingo Joseph on Pexels. This article was written with the help of AI.

What Is an APN and How to Manually Configure Mobile Access Point Names

Mohi Moha — Sat, 26 Sep 2026 18:17:54 +0000

If your phone shows full signal bars but mobile data refuses to load a web page, or picture messages won't send, the problem is often the APN. It's one of those settings most people never touch, until they switch carriers, import a phone, or use a smaller network that doesn't configure itself automatically.

What an APN actually is

An Access Point Name is the gateway between your carrier's mobile network and the internet. When your phone starts a data session, it tells the network which APN to use. The carrier uses that to decide:

which IP address and network path you get
whether traffic goes to the public internet, an MMS server, or a private corporate network
how your usage is billed

Think of it as the phone saying, "Connect me to this door into the internet."

When you need to set it manually

You moved to a new carrier or an MVNO (a budget network running on a bigger carrier)
You bought an imported or unlocked phone that doesn't have your carrier's profile
Mobile data works but MMS doesn't, or the other way round
Hotspot/tethering fails even though data works on the phone
After a SIM swap or software reset

The APN fields, decoded

Your carrier's support page lists the exact values. Here's what they mean:

Field	Meaning	Typical value
Name	Any label you like	"Carrier Internet"
APN	The gateway name (the important one)	e.g. `internet`, `fast.carrier.com`
Proxy / Port	Rarely used for data today	blank
Username / Password	Sometimes required by MVNOs	often blank
MMSC	Picture-message server	carrier URL
MMS proxy / port	MMS gateway	carrier value
MCC / MNC	Country and network codes	auto-filled from SIM
Authentication type	PAP/CHAP	None or PAP
APN type	What this APN handles	`default,supl,mms` (or `default,supl` + separate `mms`)
APN protocol	IPv4, IPv6, or both	`IPv4/IPv6`

The two fields that fix most problems: APN and APN type.

Setting an APN on Android

Open Settings → Network & internet → SIMs (or Mobile networks).
Choose your SIM, then Access Point Names.
Tap + (Add) in the top corner.
Enter the values from your carrier: at minimum Name, APN, and APN type.
Tap the three-dot menu → Save.
Select the new APN with the radio button.
Toggle Airplane mode on and off, or restart.

On Samsung: Settings → Connections → Mobile networks → Access Point Names.

If APN settings are greyed out, your carrier has locked them. Contact the carrier or check that the SIM is inserted and active.

Photo by Miguel Á. Padriñán on Pexels

Setting an APN on iPhone

iPhones usually get settings automatically through carrier bundles. When they don't:

Go to Settings → Mobile Data (Cellular) → Mobile Data Network.
Fill in the APN, username and password under Mobile Data, and the MMS section if needed.
Restart the iPhone.

If the menu isn't visible, your carrier doesn't allow manual APN changes, or you need to install a configuration profile from the carrier's website.

Troubleshooting checklist

Data works, MMS fails: add mms to APN type and fill in the MMSC fields.
MMS works, data fails: make sure default is in APN type.
Hotspot fails: some carriers require dun in APN type or a separate tethering APN.
Everything fails: check Mobile data is on, Data roaming is on when abroad, and your plan has data.
Nothing sticks after restart: reset network settings, then re-add the APN.

Watch the setup

Conclusion

An APN is a small text setting with a big job: pointing your phone at the right door into the carrier's network. Once you know the handful of fields that matter, fixing broken mobile data takes two minutes.

Travelling or switching networks often? Choose a phone with broad band support. The latest phones on infozme list network specs so you can check before buying.

Cover photo by Akil Mazumder on Pexels. This article was written with the help of AI.

How to Configure Multiple Profiles or Work Profiles on Android

Mohi Moha — Sat, 26 Sep 2026 16:57:58 +0000

Android has quietly supported multiple "personalities" on one device for years. You can keep work apps separate from personal ones, give a family member their own space, or hide sensitive apps behind a second lock. The problem is that the features have confusing names and live in different places depending on the brand.

This guide untangles the three main options and shows how to set each one up.

The three kinds of profiles

Feature	What it isolates	Best for
User profiles (multiple users)	Everything: apps, accounts, files, settings	Shared tablets, family phones
Work profile	A separate container for work apps inside your main user	Work/personal split on one phone
Private Space / Secure Folder	A locked, hidden container for chosen apps	Privacy and sensitive apps

Under the hood, Android treats each of these as a separate user ID with its own encrypted storage. Apps in one profile can't read files or data from another unless you explicitly share.

Option 1: Multiple users

Multiple users are like separate phones sharing one piece of hardware.

Go to Settings → System → Multiple users (on Samsung phones: Settings → Accounts and backup → Users, available on tablets and some phones).
Turn on Allow multiple users.
Tap Add user, then hand the phone to that person to set up their Google account.
Switch users from the quick settings panel.

Things to know:

Each user has to install their own apps, which uses more storage.
Notifications from other users are limited while you're not switched in.
Many phones only offer multiple users on tablets, so check your model.

Option 2: A work profile

A work profile gives work apps a briefcase badge and keeps their data in a separate container. You can pause it after hours with one tap.

If your company provides one: install the app your IT team names (often "Android Device Policy" or Microsoft Intune Company Portal) and sign in with your work account. The profile is created automatically.

If you want one for yourself (no company MDM): open-source apps can create a work profile on your own device:

Shelter: isolates apps and lets you "freeze" them
Insular: a fork of Island with similar features

Both use Android's official work profile APIs, so no root is required. After setup:

Clone the apps you want into the work profile (Chrome, Slack, Gmail).
Sign in with work accounts only inside the profile.
Use the Work apps toggle in quick settings or the launcher to pause the whole profile.

Developers can confirm profiles from a computer using ADB:

adb shell pm list users
# UserInfo{0:Owner:c13} running
# UserInfo{10:Work profile:1030} running

Photo by Rickie-Tom Schünemann on Pexels

Option 3: Private Space or Secure Folder

On Android 15 and later, Private Space creates a hidden profile with its own lock:

Settings → Security & privacy → Private space.
Choose a separate lock or reuse your screen lock.
Install apps into it from the Play Store inside the space.

Samsung has offered the same idea for years as Secure Folder (Settings → Security and privacy → More security settings → Secure Folder).

When locked, these apps disappear from the launcher, recents and notifications.

Tips for living with profiles

Different wallpapers or themes per user help you notice which one you're in.
Contacts: decide whether the work profile can show caller ID for personal calls (Settings → Passwords & accounts → Work → Contact search).
Battery: paused work profiles save power because their apps can't run.
Backups: work profile data is usually backed up by the company, not your personal Google account.

Video walkthrough

Summary

Use multiple users when different people share a device, a work profile when you want a clean, pausable split between job and life, and Private Space or Secure Folder for apps you'd rather keep hidden. All three are built into Android, free, and far more secure than "app lock" tricks.

Profile support varies by brand and Android version, so check it before you pick a new phone. infozme's brand pages make it easy to compare models by manufacturer.

Cover photo by tu nguyen on Pexels. This article was written with the help of AI.