I installed the recent MMS update on my iPhone 3G some hours ago and it worked fine! I just tried it right now, and it looks like MMS/picture messaging does not work. Whenever I try to send an MMS message, I get the following error: “Your message was not sent. Tap Try Again to send this message.“. A red exclamation mark appears next to my message and photo that I’m trying to send.

I did a search on Twitter, and it appears that I’m not the only one who has this problem! Other people are having it too. If you are getting an error message, please let us know in the comments. I’m not surprised that AT&T is having these problems today, hopefully they get it fixed soon.

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

1. If you have iTunes open, then right-click and click Quit to close iTunes.

2. Go to Applications -> Utilities and open the Terminal application.

3. Copy and paste the following command in to Terminal: defaults write com.apple.iTunes carrier-testing -bool TRUE

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).

6. Connect your iPhone 3G/iPhone 3GS to your computer and open iTunes.

7. Press Option on your keyboard and at the same time click on Update in the iTunes window.

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!

Page 2: Enable MMS on iPhone 3G/3GS 3.0 or 3.0.1 using Windows

Tomorrow AT&T will be releasing Picture/Video messaging aka MMS to iPhone 3G and iPhone 3GS users. According to AT&T’s Facebook page, MMS will be enabled on late morning, Pacific time, on Friday.

AT&T will be issuing a carrier update through iTunes (not a firmware update) in order to enable MMS. A carrier update file will only be a few kilobytes so it won’t take long for iPhone users to add MMS functionality. Many of our readers have been lucky enough to already enable MMS on AT&T iPhone 3G/3GS 3.1 using a guide I posted a couple of days ago.

Millions of users are expected to be using MMS on their iPhone tomorrow. While many AT&T users are excited about MMS, there are some users who are not excited about this for fear of AT&T’s network slowing or possibly going down. Will AT&T be able to handle all the MMS traffic, or will they go down? Let us know how you feel about MMS coming to the iPhone tomorrow, and whether or not you think AT&T will be able to handle all the traffic.

In just 4 more days AT&T will issue a software update which will allow iPhone 3G/3GS users to use MMS for free. AT&T originally planned on enabling MMS for iPhone users earlier, but they had to delay it because they wanted to make sure their network would be able to handle all the MMS traffic. In this post I will show you how you can enable MMS on your iPhone 3G/3GS on iPhone 3.1 firmware right now. All credit goes to Aaron Krill for this.

Note: I am not responsible for anything that happens to your device as a result of following this tutorial. Performing this hack may void your iPhone’s warranty. If this does not work then just wait until September 25, AT&T will issue a free update that allows you to enable it. If you get a red exclamation mark after following this tutorial, then that means you’ll just need to wait for AT&T to officially release MMS.

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

1. If you have iTunes open, then right-click and click Quit to close iTunes.

2. Go to Applications -> Utilities and open the Terminal application.

3. Copy and paste the following command in to Terminal: defaults write com.apple.iTunes carrier-testing -bool TRUE

4. Press Return on your keyboard.

5. Download IPCC file (right click this link and save it as ATT_US.ipcc).

6. Connect your iPhone 3G/iPhone 3GS to your computer and open iTunes.

7. Press Option on your keyboard and at the same time click on Update in the iTunes window.

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!

Page 2: Enable MMS on iPhone 3G/3GS using Windows

In a press release today AT&T has announced that the iPhone 3G/3GS will finally be getting Multimedia Messaging Service (MMS) support. Many iPhone users have been waiting impatiently for this, and AT&T has finally announced a release date.

AT&T says that MMS will be coming to the iPhone 3G/3GS on September 25 through a free software update. That means the iPhone 3.1 update will not support MMS, because it’s rumored to launch on September 9, the same day the iPod Touch 3rd generation is announced by Apple. Apple will probably issue the MMS update in an iPhone 3.1.1 update.