@mears148

I'm late to this party, having just installed my Alien Router a few days ago. Having stumbled on to this thread, I decided to confirm I had no issues with WiFi calling, but discovered to my surprise that i DID!

I have an iPhone 11 Pro; my spouse has an iPhone X. Both are running iOS 13.6. If I put both phones into Airplane mode, with both phones set to use WiFi calling, my wife's phone can make calls, but mine cannot.

Two levels of support staff at T-Mobile were unable to resolve this; they transferred me directly to an Apple Support engineer, who basically had me repeat cycles of "Reset Network Settings," toggling WiFi calling off and on, power cycling the phone, and ultimately I became able to make calls over WiFi from my iPhone 11. When I could not, the phone would post a dialog to the screen every time I tried to place a call stating that no network was available, and that I would need either to join a WiFi network or turn off Airport Mode. However, the on-screen icons and the phone's behavior confirmed that I WAS connected via my AmpliFi router's wireless LAN, it was clear that I could use multiple internet services as well; e.g., web browsing from my phone (at a blistering pace, perhaps because of WiFi 6).

Ultimately she was able to make my iPhone 11 Pro capable of placing and receiving calls while in Airplane mode and dependent on my WiFi network.

Slow WiFi Performance

WiFi Calling On iPhone's