If it says "Enter PUK" or something like that. It needs a code from a service dealer or if your phone ISNT prepaid, you can go to at&t online. Log in, go into services, and get your PUK code to unlock your phone. PUK is like a theft lock, helps prevent thieves from taking your phone. If you get it wrong 10 times, it permanently locks your SIM card. If its permanently locked, you gotta go to a retail store from your provider and get a new SIM card. If your on prepaid phone, you gotta get tech support to help you unlock your phone or at a store as well. Tech Support: 1-800-901-9878 for AT&T Prepaid.
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YOU MAY.. -call us at 789 then ask for PUK code -register your mobile number online and get PUK code
This can only be found in the documents that came with your phone.
This is especially shown when your phone calls to the person go straight to voice mail. AlsO ask people if they blocked you and take it up with your network carrier.
*67 it may be blocked
The PUK-code is (Personal Unblocking Key). It is NOT unique for Nokia phones. If a user enters the wrong PIN-code 3 times in a row, the telephone asks for the PUK-code as is supplied by the network operator for that telephone. Don't lose it! If the PUK-code is wrongly entered 10 times in a row the SIM-card gets locked up permanently.