Antitheft cipher chain lock for mobile telephone

The utility model relates to an antitheft device for mobile telephone. A plurality of cipher rings and washers are sequentially arranged inside a lock casing. An inner circle of each cipher ring is provided with a gap corresponding of number of an outer circular plane. The width of the gap is one tenth of the circumference of the inner circle. A rear end plane of the lock casing is provided with an insertion hole. The lock is provided with a lock head which can be inserted from the insertion hole. The front section of the lock head is provided with a plurality of gears corresponding to the position of the washer and in the same light with the washer. The number of the gear is same as that of the cipher ring. The lock casing is provided with a vertical strip-shaped hole, and the shifted cipher ring. The front end and the rear end of the lock casing are respectively connected with connecting chains produced by fine steel wire ring and connected between the neck, clothes and the mobile phone. The gap of the inner circle of each cipher ring inside the lock is preferably corresponding to different numbers of the outer circle. At least three cipher rings are arranged inside the lock. By adopting the cipher chain, the theft of the mobile phone in the busy street or the tourism can be effectively prevented regardless of hanging on the neck or waist. The utility model has the advantages that: First the hanging chain is produced by the fine steel wire ring of none easy shearing or tearing. Second the lock has a specific cipher of a plurality of digitals, and the mobile phone and the hanging chain can be separated by that all the cipher rings rotated to the cipher and the gap of the inner circle of the cipher ring and the gear of the lock head are in the same line. The mobile phone can not be easily stolen thanks to a plurality of combinations for the number of the cipher. The chain lock effectively prevents the occurrence of the theft of the mobile phone.