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for some special functions such as paid call etc.
PUK Code and PUK2 Code(8-digit)
To change the locked PIN code, you need to use PUK
(Personal Unblocking Key) code. To change the locked
PIN2 code, you need to use PUK2 code. If these two
codes are not provided together with the SIM cards, ask
the local service provider for them.
To learn how to enable or disable the SIM PIN, see
"Protecting Your SIM card with a PIN" in the Security
chapter.
Warning: If the PIN code is inputted wrongly for three
consecutive times, the SIM card will be locked. Please
contact the network operator immediately for help.
Attempting to unlock the code may make the SIM card
ineffective permanently.