Here is a little guide on Tethering and enabling MMS for iPhone 3G only. iPhone OS 3.0 is required to get MMS!

HOW TO ENABLE TETHERING ON YOUR 3.0 iPhone:

Step 1: Check if you own a 3G iPhone. If you’re on EDGE (as I am): sorry. Tethering does not
seem to work with EDGE phones.

Step 2: Check to see if AT&T is your carrier. If it is: sorry. AT&T will not let you tether.

Step 3: Navigate to ~/Library/iTunes/iPhone Carrier Support. Notice the spaces in that last
folder name! If you’re at the command line, use backslashes to escape the spaces, i.e.
cd ~/Library/iTunes/iPhone\ Carrier\ Support. You will find a file with an ipcc extension.
Copy that file: e.g. cp foo.ipcc foo.ipcc.original. This creates a backup for when you mess up.

Step 4: Rename the ipcc extension to zip. For me that was ATT_US.ipcc renamed to ATT_US.zip.
(Did I mention how I’m on a 1st Gen iPhone with AT&T?). Unzip it. This creates a new folder
called Payload.

Step 5: Navigate into Payload and then into the folder under that. Mine was called ATT_US.bundle.
Yours will differ. Inside that folder you will find three files that you will
edit: Info.plist, version.plist, and carrier.plist. Open all three in the Property List
Editor that comes with the dev tools on a Mac.

Step 6: In Info.plist, change the CFBundleVersion to 5.0. Save.

Step 7: In the version.plist, change the CFBundleVersion to 5.0. Save.

Step 8: In carrier.plist do the following and then save:

(a) Add a new dictionary to the apns array:
apn = internet
password = password
username = iphone

(b) In the wap dictionary (mine is wap.cingular, sts’s was wap.dol.ie), add a new pair.
Do not edit the password or username: type-mask = (NUMBER) -2

(c) Add a new pair at the top level dictionary of the carrier.plist file. (We’re not
sure this is strictly speaking necessary but go ahead and do it.): AllowEDGEEditing
= (BOOLEAN) YES

Step 9: Zip up the Payload folder in which you just made your edits. Rename it to the same name as
the original ipcc file. (For me that was ATT_US.ipcc).

Step 10: Connect your iPhone to iTunes.

Step 11: In the Summary tab, option-click “Check for Update”. Navigate to your ipcc file, select it.
It takes no more than a second or two to update.

Step 12: Reboot your iPhone.

Step 13: In prefs (on the phone) navigate to Settings > General > Network.

Step 14: Let me know how this worked for you.

HOW TO FIND A CARRIER IPCC FILE:

curl -s -L http://phobos.apple.com/version | grep -i carrier

via here: http://gist.github.com/81465

US AT&T Customers: I don’t have specific details on adding tethering to your account but just
give AT&T a call. They’ll help with the billing.
Note: UK People start here: http://twitter.com/timmeh/status/1351833678
Note: US People look here: http://tinyurl.com/cstrqx (New version by Michael Johnston of iPhone Alley)

 

How to Enable MMS for the iPhone 3G With OS 3.0 on AT&T.

     *****USE AT YOUR OWN RISK*****

1) This is experimental. The instructions might not work or might cause your phone to stop functioning
completely.

2) AT&T does not support this officially yet. There have been some reports of problems associated with
enabling MMS on AT&T.

3) The information is provided here for educational and informational purposes only. It should not be
used on any phone.

This requires an iPhone 3G loaded with the iPhone OS 3.0 and 3.0 SDK installed onto a Mac with
Leopard 10.5.

Step 1) Prepare the ATT_US.ipcc

Follow steps 1 – 7

1) Under Root in carrier.plist add:

AllowEDGEEditing Boolean Checked
AllowMMSCEditing Boolean Checked
AllowMMSEditing Boolean Checked

2) Add the following:

Quote:
In the wap dictionary (mine is wap.cingular, sts’s was wap.dol.ie), add a new pair. Do not edit
the password or username: type-mask = (NUMBER) -2

3) Under root in carrier.plist also add:

mms_proxy String 066.209.011.032
mms_proxy_port String 80
mmsc String http://mmsc.cingular.com

Now follow Steps 9 – 12 to finish preparing the ATT_US.ipcc.

Step 2) Enable MMS on your account at at&t.

These guides originally written by Erica Sadun