Group number sim card backup

Function Characteristic：

1, This product can back up and duplicate the directory materials in GSM or  CDMA or 3G cell-phone card fast ;
2, Back up Capacity of device 16/32KB , can save 500/1000 group telephone number originally;
3, This product is that a unit is operated, do not need connecting with computer and using ;
4, After materials back up, cell-phone for instance, is it needn't afraid and lose the directory materials either to lose;
5, When users need to use different cell-phone card because of different city or country, can share the backing up device materials to any cell-phone card ;
6, Even if the power is exhausted, will not lose the materials that have already store been in the spare device either.