OK, wow! 10 hours with Verizon customer service folks, someone at a verizon store, tech folks, etc. All super helpful and very competent, yet no one can help me solve this.
We live in an area with very spotty verizon network coverage (verizon is sending a network extender tomorrow, so already know about that). If I make a wi-fi call (Optimum cable wi-fi) and have cellular on, the calls are badly compromised, as it jumps over to cell if even one bar shows up, and then people cannot hear me, or it cuts off completely. So, I started turning airplane mode on and making calls. It worked very well until recently. With airplane mode on I had no issues with compromised calls. I have an iphone 13mini (ditto on everything above for my wife on an iphone 15). Just recently (w/i last couple of months) it started to tell me, when I tried to make a call on my phone, with airplane mode ON and wi-fi connected, it would say "No Network Connection | Connect to a wi-fi network or disable airplane mode to place a call | Cancel | Disable Airplane Mode"
To save everyone time, I know all of the settings are correct (believe me when I say I am close to 10 hours on this now with folks at Verizon -- again all very nice, seemingly very competent, JUST NOT TRAINED ON THIS QUESTION).
If someone knows the answer to this question they are a phone network / wi-fi call GOD.
Why was I previously able to make wi-fi calls with airplane mode on, on my iphone, but now I am not able to (or just very rarely able to)? Is this able to be fixed?