The ICCID value contains derivatives of the IMSI and can be created using the values along with the country and network codes. The process reads the ICCID value, which is not locked by the user PIN. Many logical forensic tools cannot access the file system unless the SIM is unlocked or the user enables/disables a setting within the phone first. There is an advanced process that can be utilized when an examiner encounters a SIM card that has a user-enabled PIN enabled, and the PUK is not available. The PUK could be entered to unlock the PIN and allow users to reset their PIN value. A PUK value is not something a user can enable or change. This is also referred to as personal unblocking key.

To override a lost, forgotten, or improperly entered user PIN, manufacturers also have a personal unlocking key ( PUK).

Once a SIM has the PIN value enabled, it can affect access to different parts of the operation system on the phone and at a minimum, not allow the SIM file system to be read when it is removed from the phone and examined using SIM forensic tools. Numbers such as 0000, 1234, or the last four digit of the cell phone number (MSISDN) are common. Some manufacturers have a default PIN value set with new SIM cards. Typically the user would use the GUI of the phone to enable the PIN. This is called a SIM PIN ( personal identification number). SIM cards allow the user an option to enable security. Brett Shavers, John Bair, in Hiding Behind the Keyboard, 2016 SIM Security-PIN and PUK

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