M350 Series User Manual 55
SIM PUK: If you have typed wrong SIM PIN code and retried more than 3 times, the SIM Card
will become the blocked mode, In this case, you have to type PUK and new SIM code to unlock
SIM Card.
Change SIM PIN:If you want to change SIM PIN code, you can click Change button and type
old SIM PIN code and new SIM PIN code. Please aware not to exceed the retry number (PIN
remaining number and PUN remaining number).