The smartwatch has a Bluetooth 5 connectivity option with up to 10-meters of wireless range. And, it is compatible with devices running on Android 5.0 or above and iOS 8.0 or above.
No, it doesn't support calling feature but it has other features like Alarm Clock, Stopwatch, Timer, Reminder.
No, Bluetooth calling isn't available in this watch but yes you get the Bluetooth connectivity, but besides you get Alarm Clock, Stopwatch, Timer, Reminder.