I've activated my phone successfully(Or so I believe as I can send texts)
But I can't use anything that has to do with data?
Assuming you have the Blackberry Curve 3G, we need to perform a "register now" on your device.
Once the above steps are complete, your phone may take a few minutes (5-10) to gain access to data. If not, you can pull the battery. If that does not work to resolve your issue, I would advise calling and speaking with tech support.
-TampaMike