PUK codes
The personal unblocking key (PUK) code and the universal personal unblocking key
(UPUK) code (8 digits) is required to change a blocked PIN code and UPIN code,
respectively. The PUK2 code (8 digits) is required to change a blocked PIN2 code. If
the codes are not supplied with the SIM card, contact your local service provider
for the codes.