Abstract: A vibration unit is for use in combination with a portable telephone apparatus having a holding mode in which connection is held between the portable telephone apparatus and a base station assigned to the portable telephone apparatus. The portable telephone apparatus transmits a reception information signal in response to reception of an incoming call signal directed to the portable telephone apparatus. Supplied with the reception information signal, the vibration unit makes a vibrator vibrate to announce reception of the incoming call signal to a user of the portable telephone apparatus. When operated by the user, a holding switch produces a switch operation signal. In response to the switch operation signal, a unit control section controls to make a unit radio section transmit a holding indication signal towards the portable telephone apparatus. Supplied with the holding indication signal, the portable telephone apparatus is put in the holding mode.