It becomes a standalone watch phone with SIM card inserted, working in 2G GSM 850/900/1800/1900 MHz Network. You can send and read texts, make or receive calls on your watch.Simply like a GSM cell phone. Without SIM card, it works as a cell phone companion,receiving and making calls, getting texts via Bluetooth.
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;Sync function: QQ,wechat,Twitter,Facebook;time,schedule,read message or news;Entertainment: MP3,MP4,Camera
Function:Bluetooth Dialer,Pedometer,Sleep monitor,Sedentary Reminder,Music Player,Alarm Clock, Watch,Camera,Remote camera,Bluetooth SMS/IM Message Notifier,Message Reminder,Call Reminder,Answer Call,Dial Call,Anti-lost.
Note:Compatible with Android System(full function support)and IOS System (limited function support,it can work with iPhone as a Bluetooth device,but Notification Push,Remote capture,Anti-lost are currently unavailable on iOS)
To avoid any charging problem, first remove the battery of the watch, and then reinstalle it back, take 5V500-1000 mA charger to charge the watch 2-3 hours, and then try to boot the watch. For more reasons likely to lead to not charge . Also, Please read the instructions manual carefully; *Replace the USB cable and then try to charge the machine; 2. a long time transport, leading to the first charge cannot boot , the customer first time can use the smart phone charger to charge the watch for a long time.