Phone function make phone call directly from the smart watch, including answering and dial-up</br>Waterproof resistant</br>For iPhone, it only supports partial functions including pedometer, calendar, call sync, calculator, clock, stopwatch, music player, hands-free</br>4. 1.54" capacitive touch screen</br>5.Fitness watch -various health tracking app designed to monitoring the situation of your sleeping, walking</br></br>Product Description</br></br>How to use:  1, to use as a standalone smartwatch, simply insert a sim card into the back of the watch.  2, to use with your smartphone, simply pair with the smartwatch via Bluetooth. (Only android ask download :Open the qr code device >scan it by the scanner >install the ask on your android smartphone, iPhone doesn't need to download the ask).</br><br/>http://www.amazon.com/gp/product/B01N8VK4RQ