T-Mobile users were up in arms starting last month when T-Mobile started blocking port 80 outside email and the built-in browser. What this caused is 3rd party programs that communicated with the internet like Verichat or WebMessenger ceased working. Had a chance to talk with a T-Mobile rep and this is what he explained:
There were some changes made in the billing system a while back which in turn blocked Blackberry Web Client accounts from having full internet access (including port 80). Changes are in the works and all T-Mobile BB users should have full internet access targeted for early Feb.