WiFi Calling not working suddenly

I have not, for two reasons (of arguable validity and, possibly, ignorance):

1. WiFi otherwise works on both devices fine and, indeed, if the Wireless is off and WiFi is on, WiFi Calling works on the devices fine as well.
2. My decade of experience with Android tells me that “Network Reset” on the device is *very* destructive of things like all Bluetooth pairings as well as all remembered WiFi networks.

The latter, for me, is really a deal breaker. I can't say what this does on iOS as I've never tried it on the iPads I've had for years, nor on the iPhone which I've only had for six months now. Maybe iOS is different. When I got conned into it several times in my Android life, it fixed nothing. And it broke lots of things. My iPhone, for instance, has 18 BT pairings. That's hours of effort to get those all setup and tested again. There's no way to tell how many WiFi networks iOS knows about. But it's probably not as bad of a situation as my prior Pixel 2 was--it had over 50. Now, I knew for sure that lots of those were overcome by events and would be no loss. But which ones?!? And what of the others?!? If I had reason to know a Network Reset would fix this--other reports of people with the same problem solving it this way, say, I'd try it. Just on an off chance a miracle might occur? Life's too short.