This is not a firmware update, it’s a carrier update so you will be able to download and enable MMS quickly on your iPhone 3G or iPhone 3GS.

How to enable MMS through iTunes

1. Download iTunes 9.0.1 (if you don’t already have it).

2. Connect your iPhone 3G or iPhone 3GS to your computer and open iTunes.

3. Once the iPhone MMS update is available, you will see the following message on iTunes: “An update to the carrier settings for your iPhone is available. Would you like to install it now?“. Click “Update Settings“.

4. After you click “Update Settings“, iTunes will show the following message: “Your iPhone carrier settings were updated successfully“. Click “Ok“.

5. Reboot your iPhone 3G or iPhone 3GS. Hold down your power button until the Slide to Power off button appears, slide to power off. When your iPhone is off, press the power button to turn it on again.

You should now have MMS on your iPhone 3G or iPhone 3GS!

Note: This won’t work on the iPhone 2G.

Related posts:

1. iPhone 3.1.2: Carrier update
2. Enable AT&T iPhone 3G/iPhone 3GS MMS Update on iPhone 3.0/iPhone 3.0.1
3. Enable MMS on AT&T iPhone 3G 3.1 or iPhone 3GS 3.1