| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for detecting a safe time even when power is supplied to an SIM card in communication equipment. SOLUTION: A method for protecting a circuit module in communication equipment includes a step for judging whether the circuit module exists in the equipment or not. In the next step, a power source voltage concerning the equipment is measured. The power source voltage is compared with a prescribed threshold voltage in the succeeding step. When the power source voltage is lower than the threshold, a normal function is given to a telephone set in the next step to return to the comparison step. When the power source voltage is higher than the threshold, connection to the SIM card is cut off in the succeeding step to limit the function of communication equipment. |
