Can't make calls when on wifi and 4g

[newShmoo]

This is really particular. When I am on my home WiFi network, and 4g is also enabled, the phone just hangs when making the call. Doesn't connect, and also just hangs on 'ending call', so have to restart the phone. If I turn off 4g, or disconnect from the WiFi it seems to work fine. Possible that the fact that I get a very weak 4g connection in my home might be something to do with it. Spoke to support and was told it would be fixed with a repair. It wasn't. Can anyone help? 

[zilch1]

Exactly same problem!

[Nick40]

Hi,

What operator are you using and what is your SW build?

Normally the phones does not make any calls on 4G or Wifi if your operator, subscription and phone does not support it. The calls are usually done using 3G/2G.