| 摘要 |
A mobile unit having a unit for transmitting and receiving signals to and from a base station by radio telephony, an input unit for use in entering information, a display and a control unit, is provided with a first memory in which "unwritten" or "written" is stored as a state of a password for enabling the dial lock, and a second memory in which a password for enabling the dial lock is stored. When a dial lock signal is supplied from the input unit, the control unit writes a password entered at the input unit in the second memory and changes the state of a password in the first memory from "unwritten" to "written." Thereafter, except after providing the password, the mobile unit cannot be used for calling. Moreover, the password cannot be modified.
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