Hello guys. This is my Success Story...
I have been VERY VERY frustraded since march because my wife's iphone was sending MMS since beta1 mine never did.
WELL Today! i got it to work......
here's what i did:
i have a unibody macbook so i have itunes beta 8.2 10 i went ahead and installed the IPCC file using itunes and shift update. when i did that i got my mms menu and tethering and the cellular network data menu.
still no mms. I decided to call this number 1-866-700-2105 which is at&t technical support. i told the lady that my wife's phone mms works and doesnt. she compared the lines and they were the same. she sent a test mms to her phone and it worked since hers was already working. she sent one to mine and did not go throgh.
i restarted my phone and my mms icon was gone. i went to data settings and entered the mms APN:
wap.cingular
wap@cingulargprs.com
CINGULAR!
mmsc.cingular.com
66.209.11.32
restarted my iphone and as soon as the phone restarted the TEST MMS the rep had sent came through
NOW I HAVE MMS woking im soooooooooooo happy
have the AT&T rep send you a mms from their system and also use this values for the data settings
GOOD LUCK.......