Yes - suggest you review the forum for guidance.
For starters though, make sure you BB is set to be discoverable, and then go to the tomtom phone preference and have it search and try to pair with your device. The pairing has to be done by the TomTom - not the phone.
When it sees it, it will start to pair. You should get a pop=up on you BB asking to enter a pass-code - it is 0000. After that, it should say successfully set up for hands free, and offer to download your phone book. Note that it may only bring over the numbers and not names (a bug in their current app - search the forum for recent posts on just that problem).
iI should next ask if you want to set up wireless serves - say yes, and then follow the setup wizard. It may or may not be successful right off. There is a 50% chance that if not, TT servers are down, so try again at another time/day.
If no success, you may have to set up with manual settings. Again, seach the forum - it is full of what you need.
NOTE - if you don't have the correct AT&T data plan - you cannot of course set up data services.