You can use this smart watch independently without use your phone. Really cool features (texting, taking calls, music player, lost feature and camera control).BUILT-IN SIM Card Slot It Becomes a Standalone watch phone with SIM card inserted, you can send and read message, making or receive calls on your watch, like a GSM cell phone. Without SIM card, it works as a cell phone companion, receiving and making calls via Bluetooth. This Watch can Track your Active Outdoor and indoor activities - running, hiking, bicycle, treadmill, jumping, sit-up, etc. Other Features are Bluetooth Dialer, Pedometer, Sleep monitor, Sedentary Reminder, Music Player, Alarm Clock, Watch, Camera, Remote camera, Bluetooth SMS/Message Notified, Message Reminder, Call Reminder, Answer Call, Dial Call, for quick pairing. Sync function: whatsapp , Twitter, Facebook; time, schedule, read message or news; Entertainment: MP3,MP4,Camera Etc