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Thanks, that's very helpful.

Sorry, I have it now.  I had 'cellular data' off too.  Not sure how it made the call.

I have 3rd generation SE from 2022, so not so old after all.  I turned off WiFi and made a local call, but I didn't see 'LTE', just 'Public Mobile'.  Do I have to test with a long distance call, or maybe from the U.S.?

Had to look up VoLTE.  My iPhone SE is too old, but I'll try your advice when I get to Hawaii.