NEC Medias NE-103T - Settings (Continued); PIN Unblocking Key (PUK)

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Settings
PIN unblocking key (PUK)
The PIN unblock key (PUK) is an 8- digit number used to
unblock the PIN1 / PIN2 code. You cannot change the
key yourself.
In general, if you enter the incorrect PUK code 10 times
consecutively, the SIM card is locked.
However, note that the number of times you are allowed
to enter the incorrect PUK code depends on the SIM card
type. If this happens, please contact your mobile phone
company for support.