Support micro SIM card, make phone call directly from the smart watch.Available in English, Russian, Spanish, Portuguese, Italian, French, German, Dutch, Polish, TurkishANDROID System can support all function in the description.IOS System : There is no app for Iphone because IOS didn't open it. So below four functions can't sync with iphone(1. Anti-lost 2. Messaging 3. Notifier 4. Remote Camera),But all other function can use normally because no need to use app.All market bluetooth watch are like this.1.54 inch TFT HD display, high sensitive capacitive touch screen.Intelligent anti-theft anti lost, seek mobile phone.Entertainment: camera/music player.Sport health: Passometer/Sedentary remind/Sleep tracker.Sync function: Call reminder/Message reminder/Dial call.Please insert 2G network SIM card if you want to connect network, this watch only supports 2g frequency.