Two-way calls: 15 contacts are supported and call block can be set from the APP, Children will not receive any call from unknown numbers (Numbers that are not part of phone book). Watch block all telemarketing calls SOS emergency call: 3 SOS numbers can be set in mobile app. Pressing SOS key on the side of watch for 3 seconds will trigger the calls the watch will call the numbers in SOS list. If the first SOS number isn’t answered, the watch will call the second and the third SOS number automatically. Pressing of SOS key will cycled call the three SOS numbers one by one twice until the call is answered. Voice Chat on App: Not only phone call, you can also send text or voice messages to your child. It works like typical SMS chatting tool, easy to use. Alarm Clock: The watch can wake up kids every morning by setting the time in app. can set 3 alarm timings FAQ Unable to Charge the Watch? Please use the USB cable given with the watch to charge, regular USB cable are smaller and don't connect fully to charge the watch What is 2G SIM? 2G Data? My Mobile service provider says 2G is not available? 2G Data is the GPRS data that is used by watch and mobile app to communicate, All Mobile service providers(except JIO) still provide 2G services along with 3G/4G