I bought my BB Pearl last friday. I am very pleased with it. I have Tmobile.
Here's my short situation:
~ I don't know the thread, but I typed "wap.voicestream.com" under Options>Advanced Opstions> TCP> APN
~ I was then able to access the internet and download the OZ IM client, and when I later called Tmo and asked, I had no extra charges (even though I don't have a data plan!)
~ The AIM feature was not working, so I called Tmo and asked what was up. They said they had to manually enable my phone to use IM (I have unlimited texting so I'm cool with that and I said go ahead) ~ Now for some reason I can access the internet still, but the GMail app and Facebook app that I had won't load. They were loading before I had Tmo "enable" IM.