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. Epresent Smart Watch Phone Dz09 1.56 Inch Touch Screen Bluetooth 3.0 Sync Call/sms/phonebook Sleep Tracker Sports For IOS/android Smartphone. Function: Passometer,Fitness Tracker,Sleep Tracker,Camera:1.3 M Camera, Memory Card:Support 32G, Pedometer/sleep Monitor/sedentary Remind:support, Effective Distance:within 10m.