Verify that you are using the latest OS and software package from your phone provider (TMobile). To check this go to http://www.t-mobile.com/bbupgrade/
and use a TMobile phone number to get the software (any TMobile bberry number will do, you can PM me if you can't get one and I can give you one of mine for the download).
Go to TMOBILE and get the latest software for the phone you are using (DO NOT GET CINGULAR). Search for similar items in the forums to learn how to load the phone with the new software.