You should be able to obtain it from your mobile carrier or find it in your SIM card's box. If you need detailed help on that, here are 3 ways to get the PUK code of your SIM card. Where to enter the ...

A PUK code is required if a GSM SIM card was locked after entering the wrong PIN code three times in a row. Entering a wrong PUK code ten times in a row disables the SIM card permanently.

Have you ever grabbed your phone only to find it locked because you forgot ... In other words, you no longer need to be worried. PUK code recovery is pretty much easy at the moment.