Hi Sharad, it took some wheeling and dealing, but I got my hands on a t-mobile SIM. Is there some kind of trouble shooting that I can do now that I have it?
Also in my exploring and searching for an answer I looked at Settings>Network & Internet>SIM cards: and noticed a few things. 1) it was calling my Google Fi sim card a T-mobile sim card until I renamed it (curious) and 2) when I turn on airplane mode the slider next to SIM slot 1 gets turned off. (Perhaps this is to be expected)
With my old phone, since I know I’m well out of range of a cell tower, I’d have airplane mode enabled to conserve battery life, and was still able to text and call over wifi. However, with the 2e when I go to make a phone call I get an error saying I need to deactivate airplane mode before making a call. This is in spite of having all wifi calling options enabled whether in the Fi app or the phone settings. Even with airplane mode off, calls fail and I get an error that the mobile network is unavailable.
Another thing to note (I’m sorry if this is too detailed and not useful) I normally use Signal as my default messaging app, after setting my default as signal (I had to go to town to get the SMS confirmation code), I am now able to send and receive SMS messages over wifi, even if I switch my default messaging app back to the stock messenger app, even with airplane mode enabled! Signal has an option in their settings menu labeled “‘Wifi Calling’ Compatibility mode” after enabling this my SMS began to work (Haven’t tried MMS, there is still a considerable delay before messages arrive but it’s workable mostly)
So at this point I guess the reality of my issue is that Wifi calling doesn’t work when airplane mode is turned on, nor when airplane mode is off.
Let me know if somehow this T-mobile SIM can help troubleshoot.