NOTE PIN1 code cannot be mismatched for 3 times, otherwise it will enter to PUK1 state. PUK1 password cannot be mismatched for 10 times, otherwise SIM card will be locked forever. +CPIN: SIM PIN AT+CPIN=1111 //Input wrong PIN1 password. +CME ERROR: 16 AT+CPIN=1111 +CME ERROR: ...