Tried this, did nothing, it has something to do with the connection, I get 1 bar of 4G and it causes issues with voice quality on receiving end, even if I try Wi-Fi calling it's still the same, however when I switch to 3G which the phone is suppose to do, it sounds a hell of a lot better. But the phone doesn't it tries to stick with 4G (I can't keep going into settings and switching to 3G) and causes call quality issues, never had this problem with Three/iPhone. Really do like this phone, anyone got any solutions?
4G(VoLTE)/Wifi Calling introduces calling over IP packets, its still beta and being worked on and generally the quality aint great so I wouldnt expect high quality from it. Networks are allowing calling over Wifi as even though the call quality is bad, users wont complain as its still better than having no signal at all.
Calling over 4G networks (as far as im aware) is not operational on any of the networks, instead what happens is that when someone calls your phone, a signal is sent over 4G to your device, your device will then drops down to either 2G or 3G to take the call.
If your complaining about wifi calling well thats just the way it is till they perfect the software, VoLTE (4G) on three is coming later this year, dont think its operational yet
http://www.choose.net/media/guide/news/mobile-voice-calls-over-4g-launch-volte.html