Some custom ROMs let you erase the entire phone by typing a special PIN. That's too drastic. A decoy setup would benefit more ...

Luckily, there are ways to get around this by obtaining a SIM network unlock PIN. With this 8 or 16 digit code, you can unlock your phone from the original carrier and use it on any network you want.

Now you can unlock Chrome OS with a PIN code Plug in a few numbers instead of your main Google password.

Now, after Face ID fails for the first time, or you swipe up from the bottom of the screen, you'll be able to enter your PIN code and unlock your phone or approve an Apple Pay transaction.

A new developer update lets you unlock your Chrome OS with nothing more than a PIN.

PIN codes are commonly used to unlock iPhone or Android devices, access online banking, get cash out of an ATM, and pay for items using a debit card.