Padgene Bluetooth 4.0 Smart Watch for Smartphones - RD Use a prepaid Micro-sim to make phone calls with this watch, usually it works with T-mobile, 2g GSM :850/900/1800/1900Mhz bands, also you can also make Bluetooth phone calling. See Text, call and other APP notifications directly from your V13 smartwatch via Bluetooth connection to your smartphone. Precisely record your sporting data, monitor and help you manage your health quality, monitoring how well you sleep last night, help you find your cellphone when lost it. Dial,Call history,texts,setting,long time sit alarm,sleeping monitor, Anti-lost, recording, Bluetooth, daily walking steps calculating, Calculator, Web browser, Remote camera/music, changeable background picture, Micro-SIM card Slot,support apps such as facebook, Twitter etc. Support android 4.0 or above versions and iOS 8.0 or above versions, for iphone series,it only supports partial features such as Pedometer, Calendar, Call Sync, Calculator, Clock, Stopwatch, Music player control,handsfree,etc.