I have China Mobile, It have four kinds of passwords Relationship that is PIN code (PIN1) is SIM card. The personal identification code. If not the user changes the original operator to set the password is 1234 or 0000. PIN code, if enabled, boot, then every time after boot must input 4-digit PIN code, PIN code can be amended, to protect their SIM card is not used by others. Note that, if the input PIN code wrong three times, the phone will automatically lock the card, and prompted PUK code Unlock, Please update me how to PIN2 code setup in China mobile. Thanks in advance.