Enable MMS on iPhone OS 3.1

This small Tutorials will get MMS working on your AT&T iPhone. This tutorial will only work for users of iPhones running iPhone OS 3.1 on AT&T’s network.

You then need to enable IPCC updates for iTunes 8.2 (or iTunes 9) and copy the carrier (.ipcc) file to your iPhone. To do this follow the steps below.

Mac OS X:

1. Close iTunes if it is open
2. Start Terminal (Applications > Utilities)
3. Run the following command: defaults write com.apple.iTunes carrier-testing -bool TRUE

Windows 2000/XP/Vista (32-bit):

1. Close iTunes.
2. Go to Start then Run and type CMD.
3. Run this command(If you right-click on the cmd window you can paste): “%Program Files%\iTunes\iTunes.exe” /setPrefInt carrier-testing 1

Windows XP/Vista (64-bit):

1. Close iTunes.
2. Go to Start then Run and type CMD.
3. Run this command(If you right-click on the cmd window you can paste): “%Program Files%\iTunes\iTunes.exe” /setPrefInt carrier-testing 1

Download the modified bundle, To install this, follow these steps.

1. Download the file to some location on your computer
2. Plug in your iPhone
3. Start iTunes
4. Click on your iPhone in the device listing in iTunes
5. Alt-Click the “Update” button (Shift-click in Windows)
6. Browse to where you saved the IPCC you downloaded
7. Select this file and click Choose (or OK on windows i think)
8. Reboot your iPhone

Now your MMS should be working. If updating your iPhone with the carrier file is not working for you, then its because AT&T is in the process of removing the opt-out codes.