A free program for Android, by Eir3 Apps.

Do you want to experience an easier and fast connection between your smartwatch and your Android device? Then you must try this Speed Dial (Fast Dialer ext.) app. With this speed dial app, you can get through to the people you speak with the most by literally just pressing a button. This significantly cuts the time and effort you might otherwise need when calling them, which can sometimes be crucial. This app is for Sony’s Smartwatch and Smart Wireless Headset Pro devices. It requires the Eir Fast Dialer app (v.3.5.1 or above) is installed on the host device (i.e. phone). Naturally, a Smartwatch / Smart Wireless Headset Pro is also required.

You just need to long tap to initiate a call. On your smartwatch devices