Setting up Mobile Phone VoIP Softphone - Linphone (Android)

Go to the google play on your android phone and download the "Linphone" app from the google play:

Or if you prefer not to use google services then go to F-droid and download Linphone from there:

After the installation - open the Linphone.
You may get requests to grant several permissions - you can and should allow them:

After opening the Linphone you will be greeted by the setup assistant:

Choose "Use SIP account" and press "I understand":

After that enter the 1), 2) ,3) details provided by us:

and select "UDP", and press "Login".

Now the Linphone should have the green status "Connected":
and you should be able to make and receive calls.