That's why a factory reset is crucial before you sell, recycle, or donate your Android phone or tablet. It can also be a last-ditch attempt at troubleshooting persistent issues with your device.

Once that's done, make sure your phone or tablet is plugged in, then follow these detailed instructions from BlackBerry to reset. Or just dive into Settings, tap Security, then tap Security Wipe.

Managing Editor Josh Goldman is a laptop expert and has been writing about and reviewing them since built-in Wi-Fi was an optional feature. He also covers almost anything connected to a PC ...