Any Good VOIP app...

[anon(328792)]

I have Lumia 520.
I am looking for a good VOIP app where i can set my VOIP.
I tried LinPhone app. It Works fine when the app is open and Active.
If i switch to someother app and looks like this doesn't work in Background and so i don't get call.
I tried some other apps but those are specific to certain providers.

Is there any known good VOIP app available to use?

Thanks in advance...

 

[anon(8657436)]

Try Viber but it requires both the people to have it installed. Similar services are Line, WeChat.

 

[davidblack1]

I use viber but now i am switching to Smartgroshen app with good quality of voice.

 

[AV2RY]

MobileVoip this what I use to call overseas (available for all 3 mobile OSes and on PC (Nonoh on PC)) But I'm not if you can receive calls on it, so it doesn't run in background