T-Mobile iPhone 3G/3GS OS4.0 Upgrade - How to install "Cellular Data Network" tab and get picture messaging to work!

I had a hell of a time trying to find information on getting my iPhone data and pix messaging to work on T-Mobile with the new OS4.0 upgrade. I decided to make a quick blog with information on how to configure a couple options so you can get back on your way.

This is for a jailbroken and unlocked iPhone on the new 4.0 operating system. This information works on ALL iPhones and ALL firmware.

One thing that happens in the new 4.0 upgrade is that the "Cellular Data Network" option gets removed under General/Network settings. This is a big deal if you are on T-Mobile because you can't configure all of your data settings!

How to get your "Cellular Data Network" Tab :

1. Use Safari on your iPhone and log on to http://help.benm.at

2. Scroll down to the "Tethering" option and click through

3. Select your country from the list (United States)

4. Now select your carrier (T-Mobile)

5. Let the package install and reboot your iPhone.

6. When you reboot, go into Settings/General/Network. You will now see a tab for "Cellular Data Network"!

When you click through, you will see that the data address is already setup and entered in the field. Your data is now working! (Of course, you must have a data plan for this to work)

How to get your picture messaging working:

*If you already have an iPhone file browser/SSH and PList editor installed you can skip to step 3*

1. Download and Install an iPhone file browser software, there are many options available. I have a PC and used DiskAid (Available here: http://www.digidna.net/products/diskaid)

You need to be able to access the file system! (You can also use OpenSSH if you have it setup on your iPhone, you just need access to the file system)

2. Install a PList editor. This is what will convert the binary code into XML. There are also websites that do coversions online, I couldnt find any when I searched so I used PList Editor (Available here: http://www.softpedia.com/progDownload/plist-Editor-for-Windows-Download-121084.html)

3. Start up your iPhone file browser, you should be in the ROOT folder (if not, look for the root folder and get into it)

4. Navigate to /var/mobile/Library/Preferences/com.apple.mms_override.plist

5. Open com.apple.mms_override.plist in your plist editing software (or conversion site)

and replace all of the text inside with this:

<?xml version=”1.0″ encoding=”UTF-8″?>

<!DOCTYPE plist PUBLIC “-//Apple//DTD PLIST 1.0//EN” “http://www.apple.com/DTDs/PropertyList-1.0.dtd”>

<plist version=”1.0″>

<dict>

<key>MMS</key>

<dict>

<key>GroupModeEnabled</key>

<false/>

<key>MMSC</key>

<string>http://mms.msg.eng.t-mobile.com/mms/wapenc</string>

<key>MaxMessageSize</key>

<integer>1048576</integer>

<key>MaxRecipients</key>

<integer>10</integer>

<key>MaxVideoBitrate</key>

<integer>131072</integer>

<key>Proxy</key>

<string>216.155.165.50:8080</string>

<key>UAProf</key>

<string>http://www.apple.com/mms/uaprof.rdf</string>

<key>UserAgent</key>

<string>SonyEricssonW800i/R1L</string>

</dict>

</dict>

</plist>

If you put the file onto your computer and then edited it, drag it back onto your phone and replace the old file. If you edited the file directly through the file system make sure you save it.

Now reboot your phone and enjoy the new upgrade!