ok i have mms and data working on ios6 settings on video are outdated there are no wap.cingular
here are the instructions to get mms and data working no http://www.unlockit.co.nz needed
SystemConfiguration/preferences.plist
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replace phone to att.mvno you will find two "phone" in this .plist replace both to att.mvno
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I found the first "phone" and replaced it with att.mvno, but I didn't find the second one. Can you pretty please give a more detailed account as to where the second "phone" is? Or which lines to replace? This has been a nightmare! Thanks!