EOBP(TM) kids smart watch phone GPS Tracker Wifi Locating GSM Remote Locating Security SOS Alarm Antilost phone watch for children (Blue) This listing of the smart watch is the US version, which runs on 2G GSM 850/1900 MHz. It works in USA, Canada, Mexico, Argentina, Brazil and some American countries. Watch supports GSM Nano SIM card. Plan with talk, text and 2G data is required. We recommend T-mobile in the US. Dual-mode conversation:this watch can add contacts (15members) and directly call Support more precise position locating modes:GPS+wifi+LBS,GPRS real-time positioning, tracking, monitoring Other functions: Group chat, voice message, text message, add friends, SOS, pedometer, alarm, history path, the safety area, low battery alarm, remote shutdown, etc