Enable AT&T iPhone 3G/iPhone 3GS MMS Update on iPhone 3.0/iPhone 3.0.1

Enable MMS iPhone 3G/iPhone 3GS 3.0 or 3.0.1
A lot of iPhone 3G and iPhone 3GS users are still using firmware 3.0, due to the fact that a Windows jailbreak has not been released for iPhone 3.1 firmware.  AT&T released MMS for the iPhone today, and many jailbroken iPhone 3G/iPhone 3GS users still want MMS on their iPhones but don’t want to update to 3.1 until there is a jailbreak released for it. Thankfully this can be done! I’ve added the AT&T 5.5 carrier profile download which AT&T released today. Follow my guide below to learn how to add it to your iPhone 3G or iPhone 3GS.
Note: If you are on iPhone 3.1 firmware, follow my Enable iPhone 3G/iPhone 3GS MMS update through iTunes instead.

Enable MMS on AT&T iPhone 3G/3GS 3.0 or 3.0.1 using Mac

Quit iTunes
1. If you have iTunes open, then right-click and click Quit to close iTunes.
Open Terminal
2. Go to Applications -> Utilities and open the Terminal application.
ATT IPCC Command in Terminal
3. Copy and paste the following command in to Terminal: defaults write com.apple.iTunes carrier-testing -bool TRUE
Return key
4. Press Return on your keyboard.
5. Download IPCC file (this IPCC File is the latest 5.5 file that AT&T released in iTunes today, right click this link and save it as ATT_US.ipcc).
Open iTunes
6. Connect your iPhone 3G/iPhone 3GS to your computer and open iTunes.
iTunes Update
7. Press Option on your keyboard and at the same time click on Update in the iTunes window.
AT&T iTunes IPCC
8. Locate your ATT_US.ipcc file you downloaded in step 5 and click Choose.
9. Time to reboot your iPhone. Hold down the top button of your iPhone until the “slide to turn off” message appears, slide and turn your iPhone off. Turn your iPhone on again and it should have MMS on it!

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