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I've had the same experience, AT&T works very well though.

I just got back from the US to a message that said:

Great news! You’ve saved £1,489.55 over the last month while using your phone abroad...

Why they wouldn't improve the UX for such an amazing feature isn't hard to figure out...

I found the opposite, AT&T sucked but tmobile was ok.

In my experience (as a domestic user) both AT&T and T-Mobile can be acceptable or can suck, depending on exactly where you are in the country, and sometimes even within a city or suburban area (for example, in the city where I used to live T-Mobile sucked at home, but was great at work, while AT&T was exactly the opposite). Those nice homogeneous-looking maps of "coverage areas" are lies, to a very large degree. :-)

If you're traveling for work, maybe ask the people you're working with which carrier is best at their site.

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