Function Characteristic 1. To back up and restore your phone book data in cell-phone cards, avoid data loss from losing or damaging a cellular phone. 2. Support SIM card standard of GSM11.11, GSM11.12, GSM03.08, GSM13.40, CDMA3GPP2C.S0023-1 and ISO7816-1/2/3. 3. Capacity 8KB, can store 250 group telephone number. 4. Single unit, no PC or PDA required. 5. Support data exchange among different SIM cards. 6. Even if power consumption is used up, the data will be kept well in the memory. 7. Colors optional: BLUE, SILVER and RED.