Compatibility - SamsungGoogle Pixel/Pixel XLHTC Sony LG HUAWEI ZTE(Attention for iphone 7 iPhone 6 iPhone 6 plus iPhone 5 iPhone 5s  iPhone 4 iPhone 4s this APP can' t be installed by iOS Our watch can only receive and make call after connect with iphone. Other functions are unavailable now for iphone!)</br>Main Functions - It runs Facebook TwitterWhats app independently when you put SIM card and TF card in this watch.</br>Bluetooth mode- For Android smartphonesit supports anti-lost phone book Fundo (sports app) remote cameraPedometer alarm clock sleep monitor sedentary remind calendar calculator voice recorder MP3 MP4 muti-timezone muti-language daylight saving time and notification push including facebooktwitter emailcallstextsetc. For iPhone it only supports music player handsfree/making calls through Bluetooth connection.</br>Use as a independent phone - If put SIM card in the watch you can make phone call directly from the smart watchincluding answering and dial-up. If not put SIM card you can connect watch with phone by bluetooth?? then you can make phone call?? including answering