Sprint Nextel ic502 - Manual (Page 105)

Section 2C: Setting Your Phone’s Security 91
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Unblocking the PIN
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
Important: 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.