Good topic as I've wondered this myself.
It seems like the most non-techie solution is to use the local Thai SIM card in your existing phone for maps, Line, TF, etc then switch the SIM back in your hotel to check on life back in the world.
The dual SIM capability is interesting. I can check and see if my iPhone 12 has that. Per Apple, supported 2-SIM networks in Thailand appear to be:
Thailand
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