I was on AT&T and their roaming charged me $600 because I accidentally left it on, on a Vancouver trip for a day. They did refund some of that, but T-mobile's free roaming with 4G speeds is a game changer.

Overall T-Mobile has the best bang for buck if you live in an area where they have coverage.

Although US carriers are sometimes quite behind what other countries offer. I am constantly blown away at how cheap and fast cellular internet is in India with Jio. Or south korea, or japan.

Asian countries make US look like a joke when it comes to internet speed and cellular technology.

T-Mobile's free data and texting in many countries is the primary reason I stick with them despite being able to find lower prices and better coverage elsewhere.