Using the card Rule No. 1. Never write down the PIN-code on a plastic card: in case of theft or loss of the card, unauthorized persons can easily withdraw funds from it. Rule # 2.

A PUK code for a SIM card, which stands for Personal Unblocking Key, is an eight-digit code that enables a blocked SIM card to be unlocked. When a user repeatedly enters a wrong PIN code, such as ...

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.