The quality of the sound in Nexology when you call somebody is quite great to be honest. I have used it quite a few times and its very user friendly as its interface is simplest of all.

Nexogy Teams is no. one in customer service from my point of view

The app has both iOS and Android versions for making international calls. It has a great coverage like 17 countries. We also get the call forwarding call waiting and all other normal features like a normal phone call.