This watch has two working mode. One of the working mode(Bluetooth), It enable to make call or receive call or send or get message via Bluetooth The another  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

This watch has two working mode. One of the working mode(Bluetooth), It enable to make call or receive call or send or get message via Bluetooth The another  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.

 Network & Connectivity SIM Card Single SIM Card (Micro SIM Card) Frquency Band GSM 850/900/1800/1900 MHz Bluetooth Bluetooth 3.0 RAM 128M ROM 64M External memory Support TF card up to 32GB Display Screen Size 1.5 inch Screen Type TFT LCD Screen Resolution 240 x 240 pixels Camera Camera 0.3 M Video Recording Support Media Music/video Support Hand-writing Support Picture Format JPEG, GIF, BMP, PNG Music Format MP3, WAV Video Format MP4 General Languages English, Chinese Bluetooth Dialer Support Contacts Support Call Reminder Support Clock Support Anti-loss Support Pedometer Support Sleep Monitor Support Sedentary Reminder Support Battery 380 mAh Talk Time 90 minutes Working Time 72 Hours Standby Time 80 Hours SMS Support USB Port Mini USB 5pin interfac