I spent a week camping near the California/Arizona border and my phone was absolutely flummoxed by the time zones. It was constantly jumping back and forth an hour.

The weirdest part is that I wasn't even _that_ close to the border, it was 30-40 miles away. I know there is some room for error with phone location tracking but I've never had a maps app consistenly confuse my location with a spot 40 miles away.

I wonder if it has to do with which towers it is connecting to rather than where it thinks you are. I know time sync is important so perhaps your phone just shows you the timezone of the nearest tower and that almost always works well enough?

I have Family that lives in Lake Havasu right by the border. When driving there my phone will often get confused and switch between the 2 time zones.

We were on vacation, driving on 89 from Page to Kanab, which crosses AZ/UT state line. Several times our phones switched to different TZs. It was annoying