The Connect plan is not compatible with Smartphone/Blackberry devices, so you won't be able to keep that for the Blackberry Tour. What you'll need to do is move your line to a Select plan so that you still get unlimited messaging and add on the $29.99 feature for Blackberry Email & Web.
Reasons/Complaints abound about why advanced device data plans are $29.99 and not compatible with the Connect or Premium plan. But that's the way it is with the two largest carrier's in the US. So you've gotta pay to play.