How to Unlock the PUK Code on a Mobile Phone If Locked?. GSM phones give you the option to set a PIN code on the SIM card as a security measure.

Most people use predictable PINs that thieves try first. Find out which codes to avoid and what you should use to better protect your phone.

Want to keep your phone secure? Avoid using this common PIN code — here’s why it’s risky and what to choose instead.

It may be useful to change the PIN code of a newly purchased iPhone (if the PIN is set to 0000 by default for example) or for safety reasons to protect from fraudulent use of your phone in case of ...

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 ...

Video There's nothing particularly difficult about cracking a smartphone's four-digit PIN code. All it takes is a pair of thumbs and enough persistence to try all 10,000 combinations. But hackers ...

Your PIN code might be frighteningly easy to crack. Researchers at Newcastle University showed how a phone's gyroscope could reveal it.