A telephone device comprises a base, a handset, and a supporting device secured to the base. The base comprises a first receiving portion and a hang-up button protruding out of the first receiving portion. The hang-up button is used for ending a call when being pressed. The handset comprises an earpiece received in the first receiving portion. When the supporting device is in a resisting position, the supporting device extends into the first receiving portion for supporting the earpiece to prevent the earpiece from pressing the hang-up button. When the supporting device is in an unresisting position, the supporting device retracts into the base for allowing the earpiece to press the hang-up button.