We initially shared a news about AT&T offering MMS service for its iPhone users, and How to enable MMS on iPhone 3G and iPhone 3GS on Firmware 3.1. AT&T has officially announced MMS update facility for its users now, pre-requisite for using this service is that your iPhone needs to be on Firmware 3.1, so this MMS service wasn't supposed to be for firmware 3.0 and firmware 3.0.1 users, but fortunately the procedure we shared earlier to enable MMS on iPhone 3G and 3GS on Firmware 3.1 also works on iPhone 3G and 3GS on Jailbreaked firmware 3.0 and 3.0.1.
All you need to do is to download the latest AT&T carrier update version 5.5 (.ipcc) file and follow the step-by-step procedure we shared earlier and you are good to go, just make sure that you select latest .ipcc file (Link is given at the end) when iTunes prompts for it.
Hopefully you would have MMS functionality enabled on your Apple iPhone 3G or 3GS with Firmware 3.0 / 3.0.1 now.
Download latest AT&T Carrier Update Version 5.5 (.ipcc File)Contact Us for News Tips, Corrections and Feedback