When I connect to my Wi-Fi network the Wi-Fi calling icon is lit up. However when I make a call it becomes greyed out and I'm unable to make a call or the call is very choppy because of poor cell signal. It does not happen all the time but it does seem to happen more when I have very little or no cell signal. Any thoughts on what causes this and or how to fix it? Below is a link to the screenshot of what I'm talking about.
Thanks!