a cellular phone capable of informing a user of the deterioration of a line speech quality by raising an alarm . in the cellular phone according to the present invention , the condition in which the saturation of a transmission output lasts for a predetermined period of time or longer is detected , and a deterioration in the uplink speech quality is thereby predicted , an alarm signal being sent out to the cellular phone . thus , the user is notified that a deterioration in the uplink speech quality occurs .