I tried tapping the call button, but nothing happens

If you tried tapping the call button to make a phone call, but nothing happens, the quickest solution is to kill or close the Phoner app and then relaunch it again.

To kill or close the Phoner app:

1. Open the Phoner app
2. Kill the app, making sure that it is cleared from your phone's running apps
3. Reopen the Phoner app
4. Make a phone call and you should be able to dial out to your intended contact.

In many cases it should work, unless you do not have a stable and active Internet connection or cellular connection.