It seems that T-Mobile is having a slight issue with their network today. The only users experiencing any issues are those that own a BlackBerry Bold 9900, and while phone calls and SMS is working, email and internet is not.
Both RIM and T-Mobile are working to get this resolved as soon as possible, but I know that doesn’t help anyone that is affected by the outage. If you are a T-Mobile customer and own a 9900 let us know if your service has been interrupted. And if you are not a T-Mobile customer let us know as well, as it does seem to have moved to any other carriers at the moment.