Two Way Call - Child can make and receive calls through the smart watch, and can be setted ten phone numbers in contacts. Watch can only use 2G networks, please confirm whether there is 2G network in your surroundings. In the US, We recommend 2G SpeedTalk Card(belonging to T-mobile network), Not Supported: Verizon,Sprint,At&T.Notes:We provide the watch not include sim card,please buy sim card extra!