First post here, guys, so please be kind. I might not be posting this in the correct forum.

I unlocked and jailbroke my iPhone using Cydia and Redsnow and Ultrasnow. I can use my T-Mobile SIM card just fine. However, I cannot run any of the apps I've bought or downloaded from the App Store. All the other standard applications (i.e., camera, contacts, comass, etc.) work fine. My BofA, iChess, and any other application I've downloaded from App Store simply will not open.

Does anyone here have a clue of how I can fix? I would sure love to use my T-Mobile SIM card to make calls and play iChess.