You should reset your Android device and erase all of your personal data before you sell it, trade it in, or give it away.
Factory resetting does more than wipe data—see what else it can unlock Go to Settings > System > Reset options > Erase all data (factory reset) > Erase all data. After the erasing process, set up your ...
How to reset your network settings on an Android to fix connection issues and speed up your internet
You can reset the network settings on your Android phone or tablet by heading to your device's Settings app.
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