Abstract: A cellular telephone set is capable of allowing release dial lock function by a child even when parent manages an identification number. A control portion of the cellular telephone set is responsive to input of identification number through a key operating portion after dial lock condition is established by dial lock means to make judgment whether the input identification number is a dial lock releasing number in a dial lock releasing number storage region. When the control portion makes judgment that the identification number is the dial lock releasing number, dial lock condition of a predetermined function preliminarily set in an identification number setting information storage region is released.

Abstract: A foldable type portable telephone capable of making a dial lock function effective with simple operations is provided. In the case where auto dial lock is set, when a control unit of the foldable type portable telephone determines that the telephone is in a wait state and furthermore when an opened state of an upper case and a lower case is detected by a case open/close detection mechanism, the control unit executes activation processing of an auto dial lock unit. When a timer detects that a setting time entered in auto dial lock setting has elapsed, the control unit controls the auto dial lock unit so that it activates dial lock processing for invalidating key entries except at least an entry of personal identification codes used for unlocking in the key operation unit. After this processing, the key operation unit in the foldable type portable telephone accepts only the key entry of personal identification codes.

Abstract: A cellular telephone set is capable of being released dial lock function by a child even when parent manages an identification number. A control portion of the cellular telephone set is responsive to input of identification number through a key operating portion after dial lock condition is established by dial lock means to make judgment whether the input identification number is a dial lock releasing number in a dial lock releasing number storage region. When the control portion makes judgment that the identification number is the dial lock releasing number, dial lock condition of a predetermined function preliminarily set in an identification number setting information storage region is released.