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No the Default PUK and PIN codes are not set by you, these codes are Service Provider Dependent (SIM)
All you have to so is to call your Service Providers Customer Support (Like of T-Mobile, AT&T...).
And ask them about the PUK and PIN code, they will first Authenticate few things about the Ownership of the SIM card, and will give you the codes, in return.
I Guess, the picture is clear in front of you, Now. Regards,Waqar.
SIM pin code: This is a pin code that locks the sim card until you enter the correct code. This protects your account, even if your sim is put into another handset. To reset it, you need the PUK code: Pin Unlock Code (PUK) If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled. Phone Security Code: This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code: Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times. Which is the one that you want? The default security code for Nokia is 12345