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Description:1) Backup and copy telephone directory of SIM card. 2) Backs up and duplicates the directory information in GSM and CDMA cell-phone card fast. 3) Backs up capacity of device 8kB, can stores 250 group of telephone number originally. 4) A unit operated, do not need connection with computer and using. 5) After information backed up, cell-phone for instance, needn''t afraid the directory information to lose. 6) When users need to use different cell-phone cards because of different cities or countries, can share the backing up device information to any cell-phone cards. 7) Even if the power is exhausted, will not lose the information that have already been in the spare device either