Patent ID: 7856231

Claim:
A mobile communication terminal comprising: a radio frequency calibration data backup unit for generating radio frequency calibration backup data and storing the generated radio frequency calibration backup data in a subscriber identification module (SIM) card; a radio frequency calibration data checking unit for, upon power on of the mobile communication terminal, determining whether an international mobile station equipment identity (IMEI) included in the radio frequency calibration backup data stored in the SIM card and an IMEI of the mobile communication terminal match each other and, if it is determined that the IMEI stored in the SIM card and the IMEI of the mobile communication terminal match each other, comparing a first checksum value stored with radio frequency calibration data in an internal memory to a second checksum value included in the radio frequency calibration backup data stored in the SIM card; and a radio frequency calibration data recovering unit for reading the radio frequency calibration backup data stored in the SIM card and rewriting the radio frequency calibration data stored in the internal memory using the read radio frequency calibration backup data if the first checksum value and the second checksum value are determined to be different from each other, wherein the radio frequency calibration backup data unit is for re-generating the radio frequency calibration backup data and storing the re-generated radio frequency calibration backup data in the SIM card if it is determined that the IMEI stored in the SIM card and the IMEI of the mobile communication terminal do not match each other, and wherein the mobile communication terminal is configured to execute a normal booting process if the first checksum value and the second checksum value are determined to be equal to each other.