I've seen guides to get MMS working on the iPhone all over the internet. I've seen the ones that say installing the ATT_US.ipcc file then swapping sim cards for a while. I've seen the ones that have crap about MediaNet and I've seen the ones about calling AT&T and telling them you're a developer.
I've tried all of these and NONE of them have worked. I first installed the ATT_US.ipcc file so I have AT&T 5.0 on my iPhone but I have the Cellular Data settings of the first image not the second image.
I tried swapping sims card and setup a MediaNet account. I was able to call others from my friends phone but not send pictures just like on my iPhone. I have the option but I get an error when sending it. I setup a MediaNet account that was a waste of time.
Finally I called AT&T tier two support. I told her I was an iPhone developer and I have access to 3.0 and need her to activate MMS on my iPhone. She told me she doesn't know what I'm talking about so she put me on the phone with her manager who told me that he couldn't help me because he can't change my settings. Then he gave me this link and told me to put this info in my iPhone.
Answer Center | AT&T
I don't understand why the first two options don't work and I don't understand how people say you can
just call AT&T because it doesn't frinkin work!!