Motorola ic502 User Manual

If you enter your PIN incorrectly three times, your SIM card is 
blocked. To unblock your SIM card, you must contact Nextel 
Customer Service to get a PIN Unblock Code (PUK). Follow 
their instructions for unblocking your SIM PIN

If you unsuccessfully enter the PUK code 10 times, your 
SIM card is permanently blocked and must be replaced. 
If this happens, you get a message to contact Nextel 
Customer Service. Except for making emergency calls, 
your phone does not function with a blocked SIM card.