The invention discloses a method and a 
system for locking an SIM (
subscriber identity module) card by utilizing hardware. The method comprises the following steps that when equipment starts for the first time, an identification ID of an NAND memory and a country code and a 
network code of a PLMN (
public land mobile network) corresponding to a preset SIM card are read, a safe key is figured out through the operation of the identification ID, 
the country code and the 
network code, and the safe key is stored; when the equipment leaves the factory and starts normally after the SIM card is inserted into the equipment, a new key is figured out through the operation of 
the country code and the 
network code of the PLMN corresponding to the current SIM card, and the identification ID; the new key is compared with the safe key, if the new key is consistent with the safe key, the equipment is used normally; and if not, the network function is disabled. According to the method and the 
system for locking the SIM card by utilizing hardware, on the basis of not increasing a 
chip, the identification ID of the NAND memory of the current 
system is matched with the SIM card in a 
software mode, so that the safety on locking the SIM card with hardware is realized. The problem that the traditional 
software-only SIM card locking is not high in safety, and the cost is increased as a hardware 
chip is arranged is avoided. The requirements of network operators on locking SIM cards are well met.