Diwali falls on Sunday, 8 November this year, and a lot of families will lock the house a few days before and travel home. The same thing happens for weddings, for Eid, and for any long visit to family. The house sits empty for a week, and somebody says: "Can we leave the old phone in the drawer as a camera?"
You can. But a week is not one night, and the habits people have when they lock up a house can quietly stop the camera on the first day. The biggest one is the main switch.
This guide is for a simple setup: one old Android phone, no subscription, no cloud account, and a house that will be empty for five to ten days. It is written in plain steps, with the arithmetic shown so you can check it for your own phone.
Can an old phone work as an offline security camera while you travel for Diwali?
Yes, if you plan for three things before you leave: power, storage, and how (or whether) you will watch it from far away.
- Recording works with no internet at all. An app like Background Camera RemoteStream records with the screen off and keeps the video on the phone itself. Nothing needs to be uploaded.
- Watching live from another city needs an internet connection at the house, because the video has to leave the house somehow. If the Wi-Fi router is off, there is no remote view, whatever app you use.
- A whole week is a long time for a phone's storage and battery. Most problems with holiday camera setups are not camera problems. They are a full storage chip or a phone that ran on battery until it died.
The rest of this guide takes those one by one.
The main switch problem: do not turn off the circuit the camera needs
Many families switch off the main switch (MCB) before a long trip. It is a sensible habit for safety and for the electricity bill. But think about what it does to the camera:
- The charger loses power. The phone starts running on battery.
- The Wi-Fi router turns off too. Any live view stops at that moment.
- The phone keeps recording until the battery is empty, and then it stops. For an old battery that can be a few hours, not a week.
So the camera you set up so carefully may record the family loading the car, and then nothing.
What to do instead:
- Leave one circuit on, the one with the socket for the phone charger (and the router, if you want live view). Many homes have separate MCBs for different rooms. Find out which one feeds the socket you will use, and switch off only the others.
- If your home has only one main switch, decide honestly: either leave it on, or accept that the camera is a "first few hours only" camera.
- Use the phone's original charger or a good branded one, and put the phone on a hard, open surface, not on a bed, sofa, or near curtains. During Diwali, keep it well away from where diyas and candles were placed.
- Check the battery before you trust it as a backup. Power cuts happen in an empty house too. If the battery is weak, a short cut can be enough to stop recording. Our guide How to Check an Old Phone's Battery Before Using It as a Security Camera shows how to test it, including a simple timing test you can do tonight.
Storage: a week of non-stop video does not fit on most old phones
This is the part people do not calculate. Video size is easy to work out:
GB per day = bitrate in Mbps × 86,400 seconds ÷ 8 ÷ 1,000
| Video bitrate | Per day | For 7 days | For 10 days |
|---|---|---|---|
| 1 Mbps | 10.8 GB | 75.6 GB | 108 GB |
| 2 Mbps | 21.6 GB | 151.2 GB | 216 GB |
| 4 Mbps | 43.2 GB | 302.4 GB | 432 GB |
(These are example bitrates for illustration, not the settings of any particular phone or app. Your phone's actual bitrate depends on resolution, the camera, and what is in the picture.)
An old budget phone often has 32 GB or 64 GB in total, and much of that is already used by the system and apps. Even at a low 1 Mbps, a full week of non-stop recording needs about 76 GB. It will not fit.
What to do:
- Check free space today. Go to Settings → Storage. Write the number down.
- Delete what you don't need on that phone (old WhatsApp videos, downloads) or move it to a computer.
- Choose the lowest resolution that still shows what you care about. For a front door 3 metres away, you need to see a person and their clothes, not read a newspaper.
- Decide what happens when storage is full. Either the phone stops recording, or old video is deleted to make room. Check how your setup behaves before you leave, not after you come back. Storage, Not Heat, Is the Real Limit on 24/7 Android Recording explains the full storage arithmetic and why recording in many short files is safer than one long file.
- Do a 24-hour test. Record for one full day before the trip. Then look at how many GB were used. Multiply by the number of days you will be away. That number, from your own phone, is better than any table.
Watching from far away: what needs internet and what does not
Be clear about what you want:
"I only want proof of what happened." Then you need no internet at all. Record locally, come home, check the footage. This is the simplest and most reliable setup, and it costs nothing every month.
"I want to look in while I am away." Then the house needs an internet connection that stays on: either the broadband router (on a circuit you leave on), or a SIM with mobile data.
With Background Camera RemoteStream, the live browser view works over your own Wi-Fi, so it is for when you are at home or on the same network. To watch from another city, the app can stream to YouTube Live, which needs internet at the house. (Both the browser view and YouTube Live are listed in the app's Pro tier; check the Play listing for the current free and Pro split.)
Two numbers from YouTube's own help pages matter for a week away:
- Data use. YouTube's live encoder settings page gives a minimum of 0.4 Mbps for H.264 video at 360p or 480p. That is about 180 MB per hour (0.4 × 3,600 ÷ 8), or about 4.3 GB per day, before audio. A typical daily mobile data pack will not cover 24 hours of streaming. Stream for the hours that matter to you, such as night time, or rely on broadband. Our article on old 3G phones and mobile data has the full data-pack arithmetic.
- The 12-hour archive limit. YouTube's archive help page says streams under 12 hours can be archived automatically, and a stream that goes past 12 hours "may not be captured at all." So one long stream for the whole week is not a backup. Keep the local recording on, and treat the live stream as a window, not a storage system.
Placement: where to put the phone in a locked house
- Point it at the way in. The main door, the gate, or the back door that people forget. One phone watching the entry is more useful than one phone watching a whole room.
- Do not put it where it can be seen from outside. A phone visible through a window is itself something worth stealing. If someone does take it, the recording goes with it. Our guide What If Someone Steals the Phone That Is Your Shop Camera? covers what Android's theft protection does and does not do on budget phones.
- Think about light at night. A locked house with every light off is very dark. If you leave one small light on (on the circuit you keep on), the camera will see much more.
- Screen off. The screen is the part that makes heat and draws the most battery. Recording with the screen off is the whole point.
Check the date and time before you leave
If the phone has no SIM and the Wi-Fi is off, it cannot correct its own clock. After a power cut that empties the battery, an old phone may come back with the wrong date. Then the footage from "Tuesday night" is labelled with some other date. Check Settings → Date & time against another phone before you leave, and read Your Offline Security Camera Is Guessing What Time It Is if the phone will be offline the whole time.
Tell one neighbour
A camera records. It does not call anyone. Tell one trusted neighbour that you are away, ask them to look at the house once a day, and give them a number to call. If something happens, a person who can walk to the door in five minutes is worth more than any footage. Two Keyholders, Twenty Minutes, and Holiday Cover is about exactly this part of the plan.
The night-before checklist
- [ ] The circuit for the charger socket stays on (and the router's, if you want live view)
- [ ] Phone on a hard surface, good charger, away from curtains and diyas
- [ ] Battery tested; you know roughly how long it lasts without power
- [ ] Free storage checked; 24-hour test done; you know how many days fit
- [ ] Lowest resolution that still shows the door clearly
- [ ] Phone not visible from outside
- [ ] Date and time correct
- [ ] Recording started, screen off, and checked once after 10 minutes
- [ ] One neighbour knows you are away
If this is your first time turning an old phone into a camera, start with Turn an old Android phone into a screen-off security camera (no cloud, LAN-only), do the setup this week, and use the days before you travel as your test.
Happy Diwali, and safe travels.
Background Camera RemoteStream turns an Android phone into a screen-off camera: it records with the screen off and keeps recordings on the phone, with no cloud account needed. Its Pro tier adds a live browser view over your own Wi-Fi and YouTube Live streaming; check the Play listing for what is free and what is Pro.
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