Verykool i605 - Manual (Page 54)

supplied with the SIM card. When the PIN code request is
enabled, you will be asked for the password every time the
phone gets turned on.
If you enter incorrect PIN three times, the SIM card will be locked
and you will need to use the PUK to unlock it. PUK is usually set
by the network operator.
1. Enter the correct PUK to unlock the SIM card, and then enter
the new PIN and press OK.
2. If you are prompted to enter the new PIN again, enter it and
press OK.
3. If the PUK is correct, the SIM card will be unlocked and the
PIN will be reset.
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