Independent cellphone.To insert the SIM card and turn it into a wearable cellphone.It supports GSM 850/900/1800/1900 MHz Network.Built-in SIM card slot??Support NFC functions and Bluetooth connection.</br>Phone function:Make phone call directly from the smart watch?? including answering and dial-up. SIM slot?? support make calls by Bluetooth or smart watch</br>1.54"T LCD Touch Screen 240*240 pixels??View notifications on your wrist.SIM Card Insert?? pedometer?? Sedentary remind?? Sleep monitoring?? Remote photograph??Bidirectional anti-lost ??Alarm clock?? Calendar??Calculators</br>Compatible with many andro"ones??such as samsung galaxy s4/s5/s6/s7/note 3/4/5/??HTC?? Sony?? LG?? HUAWEI?? ZTE?? OPPO?? XIAOMI?? and so on</br>Your Best Health Manager.This is also the best gift to your fami