I can understand this is new to you and not your area of expertise, but many of us know BlackBerries pretty extensively.
It has been recommended, to wipe your device with JL_CMDer and reload the software on your phone. Set a password on your phone as well.
Maybe you could call Tmobile back and they will swap the phone out for you with another BlackBerry.
(And this is going to be a application installed on your BlackBerry, if a computer can link to a Cell phone and get information from it I promise I would revert back to the days of pagers and smoke signals)
8830 -> 8330 -> 9550 -> 9650
Just think about how far BlackBerries have come from then till now... And what else is coming.
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