COMPATIBILITY - Samsung?? HTC?? Sony?? LG?? HUAWEI?? ZTE?? OPPO?? XIAOMI?? Lenovo?? Iphone 7?? 7S?? iPhone 6?? 6s?? iPhone 5s?? 5?? 4s?? 4.</br>All functions work for Android phones. it can sync call?? sync message?? push notification?? take photos??Pedometer?? alarm clock?? sleep monitor?? remote camera?? BT music?? sedentary remind?? calendar?? calculator?? voice recorder?? MP3?? MP4?? Anti lost functions. (Please note for Iphone?? these functions don't work: sync message?? push notification?? Anti lost?? Remote camera?? BT music)</br>USE AS A INDEPENDENT PHONE - If you put a SIM card in the watch?? you can make phone call and messages directly from the smart watch?? including answering and dial-up send and receive messages. If not put a SIM card?? you can connect watch with your smart phone by bluetooth?? then you can call and answer a call receive message from the smart watch.(via bluetooth?? can not send message without SIM card</br>Capacitive full color display- Three stylish watch faces and with 1.54"een 240*240 pixels</br>It runs Facebook Twitter Whatsapp independently when you put SIM card and TF card in this watch. If you have any question or problem of the smart watch before return or leave complains please contact us by E-mail. We will do our best to ensure customer to be pleased. Include 100% money back and resend.</br></br>Product Description</br></br>Package includes  1 x gt08 Bluetooth smart watch (battery included)  1 x sub charging cable  1 x user manual   note:   Please open the rear cover and put the battery into the base according to the arrow of direction mark.     Important features   micro sim card (frequency gem/gps 850/900/1800/1900) (not included)   maximum support 32gb SD card (not included)    fad   1.What is required android version and Bluetooth version for a smartphone to work with this watch?   For android phone it supports android version 3.0 or higher. For iPhone it supports IOS 7.0 or higher.   2.How to understand that it can be used as a standalone phone?   When you insert a micro sim card & SD card it can be used to make cal