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You have to take the phone back to the Samsung authorized mobile phone service rep for your area, or get your dealer to do that for you.
If your provider does not know your pass code to unlock the phone, they will send it for service. The service tech will re-load the complete firmware package if necessary. This will however, erase all your user data.
Normaly they will charge for this type of service. In our area we pay something like $60 if the password is lost and they have to have their tech work on it.
The puk code has noting todo with your phone, imei is useless when we are looking for a puk code.
The puk code is sim card spesific it comes with the sim card when you get it or you can get it by calling your phone service provider of the sim card to get the puk code.
if you have entered the puk code wrong too many times you will make the sim card useless and you will have to contact your phone service provider for a new sim card, it will probably cost.
If you have an AT&T account: FOLLOW THESE STEPS TO NETWORK UNLOCK SAMSUNG SGH-A737
GET THE UNLOCK CODE FROM ATT CUSTOMER SERVICE 18003310500
1. REMOVE SIMCARD AND TURN ON HANDSET 2. The display will read INSERT SIM CARD 3. TYPE #7465625*638*--------# .THE DASHES ARE YOUR 8 DIGIT UNLOCK CODE OBTAINED FROM ATT CUSTOMER SERVICE. 4. U WILL GET A MESSAGE SAYING NETWORK LOCK DEACTIVATED.
after the second asterisk, you'll see a dash ("-") on your screen instead of the number you type.