If you have an Apple or an Android phone—and you probably do—you have the option of locking your phone using a PIN code. With most of these phones, you can choose a four-digit PIN or a six-digit PIN.

Guess how long it would take a computer to brute-force an 8-number password. The answer: instantly. That's according to Hive Systems' Password Table, which shows how shockingly quick passwords of ...

You'll need your AT&T Wireless transfer PIN to keep your old number when switching from AT&T to another carrier. You don't need this number when you change your phone number with AT&T. This guide ...