How To: Get MMS On Your iPhone 3G or 3GS (AT&T) Without Updating To OS 3.1
Most of the world has had MMS on their iPhone's since the launch of OS 3.0 However, in the United States, AT&T held off the launch to "improve" their network. Which ever way you slice it, iPhone users in the US were finally awarded MMS on September 25th. To use MMS, simply plug your device into iTunes and click update.
However, this method requires you to be running the latest version of the iPhone operating system. I am not currently running 3.1 for several reasons but I am still using MMS. To do the same, simply download the file bellow, option click update in iTunes, and install the file. Restart your device and enjoy MMS!
MMS carrier file*: http://dl.getdropbox.com/u/2142577/ATT_US.ipcc
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*Copyright Apple Inc. and AT&T.