I was reading on this forum a while back that no-one has had much success pairing the BB 7290 with the TomTom GO 700.
Happy to report that I have been able to pair the two devices and make calls.
I had to upgrade both of them though - here are the details:
BB 7290 - v126.96.36.199
My phone asked me to enter the PIN, I entered 0000 and hey presto!
The only thing that I wasn't able to do was download the phone book into the TomTom, so seeing as my phone is synchronized with my Outlook Contacts, I exported my Outlook Contacts to a CSV file, then copied the CSV file to the TomTom using my USB connection - named the file CONTACTS with no extension. I was able to dial from my TomTom phonebook, and get named CallerID when someone from my contacts list called me.
Hope this helps someone.