Open the Play Store and search for Zoiper or use this link for the Zoiper Softphone for Android
Download the app, open it and agree to the terms and privacy statement
3. In this case we are installing the free version. Click Yes to confirm
4. Enter the username and password separately provided to you
5. The setup should automatically fill in the hostname from the end of your username. If not, fill it in and hit next
6. Skip the proxy setup step. It should then automatically detect a TLS connection. Click finish.
7. Go through the following screens to allow permission for Zoiper to limit interruptions from other apps when you are on a call
7. (continued)
8. Allow Zoiper to make and manage phone calls. If you are not prompted to allow this, try placing a call using the number pad shown at the bottom middle of the screen.
8. (continued) Click to allow Zoiper to record audio.
You are now setup. Incoming calls will show at the top of the app and on your phone at any time that Zoiper is running in the background.