IRONLINK Smart watch GT08 Bluetooth Smart Watch Phone with Sim Card Solt anti-lost Call reminder Phone Mate (Silver) Flexible band, you can change any bands you like; Phone function: Make phone call directly from the smart watch, including answering and dial-up. Other functions: Music player, Remote camera(0.3M), Alarm clock, Calendar, Two way Anti-lost, Message Notifications, Pedometer, Sedentary remind, Sleep monitoring, Twitter, Facebook, Browser; MAXIMUM COMPATIBILITY: Compatible with 4.2 or above Android & IOS7.0 or above Smartphones. Note: the APK app only works with android, watch connects to the iPhone via Bluetooth, it only supports partial functions, and synced message does not work for iPhones; SIM slot, Single SIM card (micro SIM card) can be as a phone, support make calls by Bluetooth or smart watch; GSM/GPRS 850/900/1800/1900(2G); Call, hand free, call record, phone book; Bluetooth phone call; Support up to 32GB Memory Card; The watch works like an independent phone once the micro sim card and sd is inserted, then the watch can call, text, receive message, even surf internet.