got my ipcc from http://appldnld.apple.com.edgesuite.net/content.info.apple.com/iPhone/CarrierBundles/061-7282.20090925.3Sph5/ATT_US.ipcc
just follow these directions and you'll be good to go, jailbroken or not
Updating iPhone AT&T carrier settings to activate MMS without updating to firmware 3.1 - Brandon Goodman's posterous
Just did what Redbeard said to do and it worked like a charm!! Very easy and now I have Carrier file 5.5 and MMS!! Welcome to 2003!!
Arrgghh, so I used Firefox and got my carrier settings to 5.5, but its still not working?????
I'm jailbroken 3G with 3.0. Could the fact that I installed that SINFUL package file earlier today be messing me up??
I'm on Mac OSX w/ iTunes 8.2 .. I downloaded the att.ipcc file and got to the point of option clicking the updates but it won't let me pick the .ipcc file.. it's grayed out.
Anyone else have this problem? Am I doing something wrong?
I used Firefox to download... it's on my desktop ATT_US.ipcc ... it's only 36kb .. is that the size of the file? but when I get into itunes, and option-click updates and the window comes up to pick a file.. i can see the ATT_US.ipcc .. but it's grayed out so I can't choose it. Anyone?