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If u enter PIN code incorrectly 3 times, PIN will be blocked n phone will ask you for PUK(Personal Unblocking Key). This is a 8 digit code. If u enter Incorrect PUK for 10 times Your SIM will be lock permanently.
cell phone service provider can(Call from other no. n ask tell them for puk of ur no.) give you the PUK code aft3r answering simple security question. Later enter PUK than enter new PIN, confirm new pin. Go to -Setting -Security -SIM lock -off Disable SIM n Later Phone Lock PS:(You have to block your PIN to get access to PUK, Default PIN- 0000, 12345)
here is some info on PUK codes:
try taking battery and SIM out waiting 15 seconds and powering cell back on.
In your case I believe your SIM is now FROZEN or locked. You mostlikely will need to purchase a new SIM card.
PUK code (Pin Unlock Key) is required when you enter an incorrect PIN 3
times. After entering the wrong PIN 3 times, the card will be locked and
you will need to get a PUK code from your service provider to unlock it.
If the wrong PUK code is entered ten
times in a row, the SIM card becomes invalid and you will need to purchase a new SIM Card. The phone will display
"PUK blocked call operator".
If you try pin more than few predefined no of times your phone will ask PUK code which can also be given only by your service provider which is specific for each and every mobile number . Donot try PUK code many times or else your sim will be blocked and you will need a new sim. Contact your sim customer care department over phone. Its free of cost to get the pin or puk no. Go to the nearest service outlet of your service provider they can also help you. There is no other go than the above procedure only your service provider can give it nobody else in this world nor any software.
PUK stands for "Personal Unblocking Code". You have to contact your service provider to get it. This comes up when a PIN code is entered incorrectly too many times. If you enter the PUK code incorrectly too many times, it will deactivate your SIM. Customer Service through your service provider should be able to provide that code for you.
if it displays a phone lock, it will either say enter PIN code, enter PUK code, or it will say SIM unavailable please contact service provider. if it says that, you're outta luck. you gotta go to the nearest at&t store and ask for a new SIM card in your name. you might lose some numbers but hang in there! =)