A method for adjusting a power of a mobile phone, comprising the following steps of: a. determining whether a maximum power transmission instruction from a base station is received before establishing a phone call, wherein when the maximum power transmission instruction is received from the base station, it indicates that a specific absorption rate, SAR, test or an antenna radiation power test is to be performed; when the maximum power transmission instruction is not received from the base station, it indicates that neither the SAR test nor the antenna radiation power test is to be performed; b. determining whether an interrupt signal emitted from a range sensor is received after it is determined that the maximum power transmission instruction from the base station is received, wherein the range sensor emits the interrupt signal when a distance between the mobile phone and a human face is within a predetermined distance range; when it is determined that the interrupt signal emitted from the range sensor is received, it indicates that the SAR test is to be performed; when it is determined that the interrupt signal emitted from the range sensor is not received, it indicates that the antenna radiation power test is to be performed; c. setting a maximum output power of a radio frequency power amplifier, RFPA, to be a first output power when it is determined that the interrupt signal is not received so as to perform the antenna radiation power test, and setting the maximum output power of the RFPA to be a second output power when it is determined that the interrupt signal is received so as to perform the SAR test, wherein the first output power is larger than the second output power; and d. controlling the RFPA to output radio frequency, RF, signals with the maximum output power. a. determining whether a maximum power transmission instruction from a base station is received before establishing a phone call, wherein when the maximum power transmission instruction is received from the base station, it indicates that a specific absorption rate, SAR, test or an antenna radiation power test is to be performed; when the maximum power transmission instruction is not received from the base station, it indicates that neither the SAR test nor the antenna radiation power test is to be performed; b. determining whether an interrupt signal emitted from a range sensor is received after it is determined that the maximum power transmission instruction from the base station is received, wherein the range sensor emits the interrupt signal when a distance between the mobile phone and a human face is within a predetermined distance range; when it is determined that the interrupt signal emitted from the range sensor is received, it indicates that the SAR test is to be performed; when it is determined that the interrupt signal emitted from the range sensor is not received, it indicates that the antenna radiation power test is to be performed; c. setting a maximum output power of a radio frequency power amplifier, RFPA, to be a first output power when it is determined that the interrupt signal is not received so as to perform the antenna radiation power test, and setting the maximum output power of the RFPA to be a second output power when it is determined that the interrupt signal is received so as to perform the SAR test, wherein the first output power is larger than the second output power; and d. controlling the RFPA to output radio frequency, RF, signals with the maximum output power.