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Idk if it works with more modern bands, but back in the GSM days I used to make calls in out-of-service areas when jets flew overhead.

GSM is a bit limited because of its Timing Adance (TA) field. It should max out at 32km.

Has it always been set to that?

I’m pretty sure that I have connected line of sight to cell sites at much longer ranges than that.

Or maybe I’m remembering an old pre-gsm TDMA phone?