I'd been buying my phone's from Verizon for years, when I decided to stay in Thailand I bought a phone here, it is mostly fine in Thailand, but kind of a hooptie. But even with my US SIM it does not work well in the USA- even using roaming with the Thai SIM. So I am back pedalling to solve the problem.
I got excited after reading this- but looking on Google makes me think I already have this. The problem is it is 10 bucks a day when I'm in Thailand. I can cannot afford paying 10,000 baht a month two out of every three months.