First, let's enable IPCC updates on iTunes 8.2.

Mac OS X:
Close iTunes if it is open
Start Terminal (Applications > Utilities)
Run the following command: defaults write com.apple.iTunes carrier-testing -bool TRUE

Windows 2000/XP/Vista (32-bit):
Go to Start -> Run (
type in "command" and hit enter
Type/copy+paste this into the command console that comes up: "C:\Program Files\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
Hit enter

Windows XP/Vista (64-bit):
Go to Start -> Run (
type in "command" and hit enter
Type/copy+paste this into the command console that comes up: "C:\Program Files (x86)\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
Hit enter

There, now you can update IPCC files as you were able to in 8.1. Now, let's go get us some Carrier Bundle goodness. You can download the modified bundle right here. To install this, follow these steps.

1 Download the file to some location on your computer
2 Plug in your iPhone
3 Start iTunes
4 Click on your iPhone in the device listing in iTunes
5 Alt-Click the "Update" button (Shift-click in Windows)
6 Browse to where you saved the IPCC you downloaded
7 Select this file and click Choose
8 Wait...
9 ???
10 PROFIT!!! er, Success!
11 Reboot Phone

You now have the modified carrier bundle. With this, you can do tethering! But wait, we wanted MMS too! Well, this will unfortunately require you to have some other form of GSM (or better, AT&T) phone. I used a cheap prepaid phone from AT&T's GoPhone system (a Motorola BT60). I'm sure you can borrow one from a friend.

NOTE: AT&T Family Plan users who have a family messaging plan can skip steps 7-11

UPDATE: Seems AT&T may be blocking these steps from immediately taking effect. My best advice is to call AT&T after step 10/11 and before step 12 and tell them your MMS isn't working. They should fix it.

1 Remove the sim cards from both the iPhone and your non-Apple phone
2 Place the iPhone sim card into the non-Apple phone
3 Power on the new phone
4 Make a phone call or two (your voicemail works)
5 Log in to your myWireless account at wireless.att.com
6 It should now say that your device is whatever you put your SIM into. If it doesn't, repeat step 4 a few times.
7 Go to the "Features" tab
8 Select a "Messaging Plan", one that isn't an iPhone plan.
9 Click next and go through all the legal crap
10 You should now have MMS enabled on your account... so...
11 DO NOT ADD AN IPHONE TEXTING PLAN BACK TO YOUR ACCOUNT! EVER! IT WILL DISABLE MMS AGAIN!
12 Swap the iPhone sim card back into the iPhone
13 Reboot the iPhone

You should now have MMS and Tethering working! Tethering is easy on the Mac, simply go into Settings -> General -> Network on the iPhone and turn Tethering on, then plug your phone into your Mac via the normal iPhone cable. Your Mac will see your iPhone as a USB networking device and auto-tether you. There's also an easy step-by-step process to get Bluetooth tethering working, but in my experience it is much slower than over USB.

That's pretty much it, folks. Have fun!