AT&T has silently started to enable MMS on iPhones running version 3.1; if you wish to Jail Break and/or unlock do not upgrade until you have instructions for jail breaking 3.1.  You should not be upgrading via iTunes, use pwnage tool to upgrade as it will ensure your phone remains jailbreakable/unlockable.

If you upgrade to 3.1 and still are getting those annoying “viewmymessage.com” messages instead of MMS Perform the following:

First we need to Enable IPCC Updates in iTunes

MAC OS X

  1. Close iTunes
  2. Open Terminal (Applications > Utilities > Terminal)
  3. Run the command: defaults write com.apple.iTunes carrier-testing -bool TRUE

Windows 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): “C:\Program Files\iTunes\iTunes.exe” /setPrefInt carrier-testing 1

Windows 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): “C:\Program Files (x86)\iTunes\iTunes.exe” /setPrefInt carrier-testing 1

Ok, so now we can enable MMS

  1. Download the IPCC Package here.
  2. Ensure your iPhone is plugged in and open iTunes.
  3. On the iPhone tab hold alt and click update
  4. Navigate to the IPCC file you downloaded and install it.
  5. Reboot iPhone.  MMS Should now be enabled.

[via: krillr]

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