Stoga Smart Watch ST-041 Wireless Bluetooth Smart Phone Wrist Watch Supporting Sim Insert Anti-lost Call Reminder (Black) 100% Brand New and High quality from Stoga , sold by L.JAQUONICS ONLY! GSM 850/900/1800/1900 MHz , Single Micro SIM Card Lasts multiple days on a single battery charge Functions:Bluetooth Dialer,Bluetooth SMS/IM Message Notifier,Call Reminder,Pedometer, Sleep Monitor, Sedentary Reminder, Remote Camera,Calendar 1.56" TFT LCD Touch Screen 240*240 pixels 0.3M Camera, Video Recording Support This watch can also work with iPhone as a Bluetooth device(Means you can receive a call or make a call also sync your contacts to this watch via bluetooth).But Some functions like Notification Push,Remote capture,Anti-lost are currently unavailable on iOS because the iOS app is unavailable now,noted that! This watch has two working mode. One is company mode(Bluetooth), It enable to make call or receive call or send or get message via Bluetooth ,the other one is Network mode(Sim Card inserted) It enable to make call or receive call and send or get message via the sim card you inserted which means at this time this watch works as a real cellphone,you can hang out without your cellphone.