AUTOMATIC DIAL LOCK SYSTEM FOR MOBILE PHONE

摘要

PROBLEM TO BE SOLVED: To obtain an automatic dial lock system for a mobile phone with 5 smaller power consumption that can unlock the dial lock in real time. SOLUTION: A mobile phone 10 transmits a very weak radio wave carrying a lock release code set thereto to a lock release unit 20. The lock release unit 20 uses an authentication unit 23 to read ID information stored in an ID information storage circuit 21, applies authentication arithmetic operation to the ID information with the supplied lock release code and transmits the result of authentication arithmetic operation to the mobile phone 10. The mobile phone 10 reads the authentication arithmetic operation result stored in a code storage circuit 16, compares it with the received authentication arithmetic operation result and releases the lock when they are coincident.