@undrwater HI, Could you read my (wrongly addressed) reply to vverve, asking about your use of Nord N10 in USA, and actually using VoLTE ?
Also, I am often in rural area, and mostly use WiFi calling (which, from what I understand, shares code with VoLTE).
Have you tried WiFi calling ?
Any other info or suggestions, before I try to return recent Pixel 3A XL and buy a Nord N10 ?

@vverve oops. Sorry. I see my error. Thank you for reply.

@vverve - any more bits of info ?
I plan to buy a Oneplus Nord N10 based on your statement that VoLTE is usable in USA (on AT&T).
I would want to try it on T-Mobile.
Please let me know if you are aware of any problems with that plan.
I recently bought a Pixel 3A XL, installed latest U Touch on developer channel, and then spent many hours reading every word I could find (on UBports forum and elsewhere) as to whether VoLTE might ever have a chance.
As of 2025 Dec 21, it seems the answer is 'NOT Likely'.
I looked up prices on the other phone models that are officially supporting VoLTE, but they are not in my price range (main phone is Pixel 4XL running LOS23 unofficial, so any alternatives need to be approximately equal or better than that).
My primary reason for cell phone is 1) calls, 2) TXT, 3) occasional browser searches, 4) occasional pictures. Not much else. so the VoLTE is critical.
SO, I plan to contact Ebay seller to return the Pixel 3A XL (30 day return window closing fast), then buy the One+ Nord N10 (unlocked).
Any suggestions ?