Turn on the watch. Go to Noise Buzz. You can make calls through dial pad, call log, favorite contacts. 

Note: Make sure that Bluetooth call is connected at all times for a seamless Bluetooth call experience. 

Make sure to add frequent/favorite contacts in the <app name> in order to access them on your watch. 

In the NoiseFit Buzz, 

Go to contacts. Add up to 10 favorite contacts 

Note: If the Bluetooth call is connected, all phone calls will be displayed on the watch synchronously.