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

To unlock a T-Mobile phone, there are several requirements to meet for eligibility, and it can be a more involved process ...

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 ...