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'everywhere'
Well, rocky mountains and NY. I had a decent signal through some semi remote mountain passes but I mean they were still decent roads that led to large ski resorts so not really surprising. Try this: https://zipsim.us/coverage . The main advantage was we ordered and prepaid the sim cards and had them delivered to our first stop on the trip so they were waiting when we arrived. Then (as I remember) all I did was pop the sim in and send a text with my zip code to them and they assigned me a phone number and texted me that everything was ready. I sound like a salesman here but it was really simple.
Late May to late June. Where were you for 'everywhere'? TransAm is out in the badlands..