I just updated my phone and I have MMS 
go here to add the mms without jailbreaking
mms setting are
APN wap.cingular
user name
password
MMSC mmsc.cingular.com
MMS Proxy 0660209.011.032
mms max massage size
MMS UA prof URL
the att_US.ipcc file can be downloaded here
* Safari browser users: If using Safari to download an IPCC or IPSW, open Safari Preferences (Safari menu - Preferences) and uncheck Open "safe" files after downloading first to prevent Safari from automatically unpacking (and deleting) the IPCC or IPSW after downloading it. In addition, Safari will probably append ".zip" to the filename. If so, rename the file such that its name ends in ".ipcc" or ".ipsw" (as appropriate).
* ALL CARRIERS: Power-cycle the phone (hold Sleep/Wake until red slider appears, slide it, wait for display to turn black, hold Sleep/Wake for 2 seconds to power back on) after applying a new IPCC; some effects (such as enabling MMS support) do not take effect without a power cycle.

go here to add the mms without jailbreaking
mms setting are
APN wap.cingular
user name
password
MMSC mmsc.cingular.com
MMS Proxy 0660209.011.032
mms max massage size
MMS UA prof URL
the att_US.ipcc file can be downloaded here
* Safari browser users: If using Safari to download an IPCC or IPSW, open Safari Preferences (Safari menu - Preferences) and uncheck Open "safe" files after downloading first to prevent Safari from automatically unpacking (and deleting) the IPCC or IPSW after downloading it. In addition, Safari will probably append ".zip" to the filename. If so, rename the file such that its name ends in ".ipcc" or ".ipsw" (as appropriate).
* ALL CARRIERS: Power-cycle the phone (hold Sleep/Wake until red slider appears, slide it, wait for display to turn black, hold Sleep/Wake for 2 seconds to power back on) after applying a new IPCC; some effects (such as enabling MMS support) do not take effect without a power cycle.
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