Konka M520 User Manual page 26

2.6.3 PUK
PUK (Personal Unlock Key, 8-digit) is used for unlocking the locked PIN.
Please contact your network operator. If you enter the wrong PUK ten
times in succession, the SIM card will be invalid and you will need to
contact your network operator for exchanging your existing SIM Card
with a new SIM card.
2.6.4 PIN2
PIN2 (4-digit to 8-digit) is supplied with the SIM card. It is used for
setting "Call Cost", "Fixed Dial" and other functions. Please contact your
network operator to confirm whether your SIM card supports these
functions. If you enter the wrong PIN2 three times in succession, the
PIN2 will be locked; the PIN2 can be unlocked only after you enter the
correct PUK2.
Please follow the operations below to unlock your PIN2:
1. Enter the correct PUK2 as prompted on the display to unlock PIN2.
2. Then enter the new PIN2 and press "OK".
3. When you are prompted to enter the new PIN2 again, enter it and
press "OK" .
2.6.5 PUK2
PUK2 (Personal Unlock Key 2, 8-digit) is used for unlocking the locked
PIN2. Usually PUK2 is supplied with the SIM card by the manufacturer.
If not, please contact your network operator. If you enter the wrong
PUK2 ten times in succession, you will be unable to apply the functions
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