Those of you on a 3.0 or 3.0.1 jailbroken iPhone who were anticipating the iPhone MMS release last week might have been disappointed by the fact that you have to be on the latest 3.1 firmware to download and install the carrier update. Rejoice because there is a simple hack that will allow you to have MMS on your iPhone.

1. First, download the AT&T Profile .IPCC 5.5.

2. Make sure iTunes is closed and run one of these commands, depending on your operating system:

On Windows: Note that it took me a few minutes to get this to work… It seems I was always typing something wrong.

  • Windows XP: Go to “Start”, click on “Run” and type “cmd” then hit Enter. Now type the following: cd C:\Program Files\iTunes\ and hit ENTER then type iTunes.exe /setPrefInt carrier-testing 1 and hit ENTER
  • Windows Vista: Go to “Start” and type “Command Prompt” in search and then hit ENTER. Now type the following: cd C:\Program Files (x86)\iTunes\ and hit ENTER then type: iTunes.exe /setPrefInt carrier-testing 1 and hit ENTER

On Mac OS X:

Open Terminal by going to Applications > Utilities. Type the following: defaults write carrier-testing -bool TRUE and hit ENTER.

3. Launch iTunes and plug your iPhone. PC users should hold the SHIFT key on their keyboard (Mac users should hold the ALT key) and click on CHECK FOR UPDATE, while still holding the SHIFT or ALT key. A windows will pop up.

4. Navigate to the .IPCC file we downloaded in step 1.

5. It will update your iPhone, which should take just a few seconds.

6. Unplug your iPhone and reboot it.

7. You should now have MMS enabled.

Some people report loss of cellular data network and loss of visual voicemail. I haven’t experienced any of that but if you do, here is how to fix it.

Go to Settings > General > Network > Cellular Data Network to update your configuration.

  • Visual Voicemail change wap.cingular to acds.voicemail
  • MMS settings should match the following (leave blank fields blank):

APN: wap.cingular
MMS Proxy:
MMS Max Message Size: 614400

Reader “Since OS 7” gives an important tip in the comments.

Those receiving the 0xE800003D error: Did you install a carrier theme from Cydia? Like the AT&T logo or MakeitMine? If so remove that and try again. It seems that others before were getting that error because of this.

That’s it. As usual, since this is a hack, you are taking the risk of messing up your iPhone…