SOURCE: Entering PUK code on RIM Blackberry Pearl 8100
The PUK code, (Personal unblocking Code) is used when you enter in a PIN wrong too many times. Not sure why you would need a PUK for inserting a indian SIM card. regardless the PUK code should be entered in when the AT&T SIM is inserted in the phone and asking you for the PUK. Also PUK's can change, you may need to call and get a more current one
SOURCE: PUK code for Blackberry 7290
PUK is a unique code to unlock your phone if you entered wrong pin 3 times continuosly , to get PUK code you can call your network provider and they will give you PUK code to unlock blackberry 7290 password. Remember don't put any puk code from untrusted source since it will not make your blackberry unlocked. If you want the simple and quick method to solve this problem just change your old sim card with new one and reset your phone.
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