We are Canadian, spend our winters in USA/Bahamas. For a number of years we have kept an ATT pay as you go cell phone
and been quite pleased with it. We bought an IPad
last year. Tried to get a pay as you go data plan with ATT. I wanted to pay 6. months in advance. All went well until it came time to pay with my credit card. It has a Canadian Billing address so the computer would not allow the transaction to go through. I offered to pay 6 months in cash, still no go. We gave up at that point.
I don't know if it is still the case but that was my experience last year.
I think an unlocked phone
with a data plan, that can be used as a hot spot might be easier.
Good luck, Bob