Abstract: A method for unlocking a SIM card includes: determining, by a mobile terminal, whether a currently inserted SIM card belongs to a preset SIM card in compliance with a specific operator; controlling the mobile terminal to access a network normally if yes; detecting lock information of an IMSI corresponding to the SIM card if no; limiting the SIM card to access the network when the lock information of the IMSI exists and a lock type of the IMSI is a lock state; and controlling the mobile terminal to access the network normally when the lock information of the IMSI exists and the lock type of the IMSI is an unlock state. A mobile terminal is also provided.