Padgene Bluetooth Smart Watch GSM Phone Watch with Camera for Samsung Nexus HTC Sony and Other Android Smartphones, (Silver-Black) Use a prepaid Micro-sim to make phone calls with this watch, 2g GSM :850/900/1800/1900Mhz bands, Good for T-Mobile, Straight Talk, Simple Mobile, or any other carrier that accepts a 2G GSM Sim Card. Will NOT work with 3G only providers like ATT, Will NOT work with any CDMA Carriers such as Verizon, Sprint, Boost, PagePlus etc. See Text, call and other APP notifications directly from your V8 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,suppport 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.