Hey flu. This reminds me of a VERY ugly incident several years ago. I also have TMobile and have a Blackberry with unlimited international emails.
I can use unlimited emails but data is very expensive at something like $15 per MB. Well, I called before an international trip and asked if I could tether my Blackberry to my computer and told them the countries I was going to.
The agent told me that I could tether it free without paying for the data. They obviously goofed as it’s only free in the USA but I should have double checked.
I went a few weeks on a business trip and used the Blackberrry for Google Maps, downloading attachments on emails and a few other things.
You can imagine my surprise when I got a $4,700 bill in one month!! Yes, just one month. I called TMobile and they said there was no way I could prove that they told me that information.
They did subtract $2,000 from the bill but I had a $2,700 bill. Just an ugly and expensive experience/mistake.