PIN2 code is a GSM feature and lumped in with your PIN and PUK codes
see http://www.gsm-security.net/faq/gsm-pin-pin2-puk-puk-personal- identity-number-personal-unblocking-key.shtml Usually (in the UK at least) you are given the PIN code so you can lock access to the SIM but the PIN2 code is rarely used by most users.
PUK is to unlock access to the SIM if you have entered the PIN incorrectly 3 times and blocked SIM access. The carrier should give you this number which is random and unique to every SIM.
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