You can unlock your Android phone even if you've forgotten the passcode, but you'll usually need to factory reset the phone.

ZDNET's key takeaways Use these codes to forward calls, pay your bill, check balances, etc.Some of the codes work only on certain carriers or devices.One of the codes also might erase your data, so ...

Open the Settings app to Security & privacy. Tap Secure device to engage the Android lock screen, which is useful if your phone is lost and unlocked. Also available from this page are options to play ...