Calling with Phoner app is simple. Just key in the number you want to call and hit on the Call/Dial button.
However, if you tried tapping the call button, but NOTHING happens, this is a recently reported issue (make sure you have first keyed in the number).
The quickest solution is to kill the app and relaunch it again and it should immediately work again.
To do this:
1. Open the Phoner app
2. Kill the app
In many cases it should work, unless you do not have a Internet connection or cellular connection.
We are currently working on a fix for this issue and we apologize for the inconvenience.