Resetting your Android device to factory settings erases all data on the device and clears out unnecessary files. The reset process wipes all your information from it, including private data, messages ...

After the erasing process, set up your device and restore your backed-up data. If your device is frozen, enter recovery mode. Power it down, then hold Volume Down+Power. This article explains how to ...

When you tap delete on your Android phone, a file might disappear from your view. But it's not really gone. You've erased the index of that file, but the file itself is still in the phone's storage.