What is a PUK Lock? And how can I eliminate it??

[Droopy75]

What is a PUK, and how can I access it? Also, Do T630 codes work on 637???

[cjard]

you have entered your SIM PIN number incorrectly 3 times. The sim card is now blocked. You must phone network operator and ask them for the PUK code. Enter the PUK code correctly and choose a new PIN number

Warning: do not guess the PUK. 10 times incorrectly guessing the PUK will destroy the SIM card