HELP!!

right now I am using a SE m600i in the US on Cingular. I have been using it for a few months with no problems. I wanted to start using BB Connect and I added the Unlimited BB Plan to my act. today, but for some reason I cant get it to connect.

I am just using the BIS
Under Status I get: Not Connected.
When I try to do registration it says "Packet Data Available" and then APN Connected and then Not Connected under Status.
My BB .sis version is: 3.31 (26)
and my phone version: CXC162037 R9A002

I put my SIM card into a BlackBerry Pearl and it was getting a data connection with no problems. Any ideas on what could be wrong?