About 18 months ago I found out that Lyca was offering plans in the US, I and my wife are retired and we use our cell phones to contact each other when we travel and we use internet access sparingly. When we had an ATT plan with 700 minutes per month we only used 250 and the res...
And, if you are worrying about data/smartphone, they allow any phone on their service that will take their sim, including locked ATT phones, but data service is expensive. Luckily data is locked by default, you have to call customer service to enable it. I bought a cheap ($55) unlocked...