In theory this is quite easy. Many of you have just been updating instead of doing a full restore, which has been preserving your hacked IPCC files from back in the day. I accidentally did a full restore on my iPhone when I loaded 3.0 GM onto it. All you have to do is load the original Pre-Release version of iTunes 8.2 (18.104.22.168) onto your computer long enough to load the hacked IPCC again (if you haven't already). This will give you the option to enable MMS and Tethering once again. People are saying on here that all you have to do is contact AT&T and ask them to remove the mms opt-out codes, and Voila! it works. Will call AT&T right now and ask them to do that for my account, and if it works after that I will update this post.