You plug a flash drive into your phone with an OTG adapter, wait for the notification… and nothing happens. Before you blame the phone, know this: the vast majority of "OTG not working" cases come down to a short list of fixable causes. Work through them in order.
1. Your phone may not support OTG at all
This is the number one cause, especially on older budget phones. USB OTG requires specific hardware support — no app or setting can add it if the chip is not there. The fastest way to settle the question is to check whether your phone supports OTG with a free checker app from the Play Store. It takes under a minute and saves you from chasing ghosts.
2. The drive is formatted in NTFS
Most Android phones only read FAT32 and exFAT. A drive formatted as NTFS (the Windows default for large drives) will be invisible to your phone. The fix: copy your data to a computer first, reformat the drive to exFAT, then copy everything back. ExFAT also handles files larger than 4GB, which FAT32 cannot.
3. The OTG cable or adapter is faulty
Cheap OTG adapters fail constantly — loose connectors, broken internal wiring, or out-of-spec builds. If you have access to another adapter, swap it in. When the drive suddenly appears, you have found your culprit, and it was never the phone.
4. The flash drive itself is dying
Test the drive on a computer. If the PC also fails to recognize it, or keeps asking you to format it, the drive is the problem. Warning signs of a failing drive include random disconnects and files that corrupt on their own.
5. OTG is disabled in settings
Some manufacturers — notably Oppo, Vivo, and Realme — ship with an "OTG connection" toggle that is off by default. Search your Settings app for "OTG" and turn it on. Note that on some models the toggle switches itself off after about ten minutes of inactivity, so you may need to re-enable it each time.
A quick diagnostic order
To avoid guessing: first verify OTG support with a checker app (there are 4 easiest ways to check OTG support if you want options), then try a different cable, then check the drive's format on a computer, and finally test a different drive. If everything checks out and it still fails — including charging behaving oddly — the USB port itself may be dirty or damaged, and that is the point where a repair shop makes sense.
Most of the time, though, the fix is in steps one or two. Do not conclude your phone is broken before ruling out the simple stuff.
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