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I was pretty bummed to hear that it was going to take till the end of summer to get two of the hottest features coming with iPhone OS3, Tethering and MMS.  However after some digging I found out that it’s a simple case of upgrading your Carrier settings. All OS3 3G phones already have the features integrated and after this quick 5 second process and a reboot on the phone, everything magically appears.

The working process can be found here:
How to Enable MMS & 3G Tethering on iPhone OS 3.0 GM Build 7A341

The above blog mentions this is for Windows machines, however I’m running the following version of iTunes and it worked just fine with the GM Developer Release.

I have not yet tried the process on windows, however on mac, I simply downloaded this file, renamed the file to remove the .zip extension, and did an Option + Restore click to select and apply the new carrier file.  After a quick reboot, teathering works flawlessly and MMS is still spotty, but all the features are there.  Note I also tried this on a 2G phone and it did not work, the phone still works fine but the features are missing.  I plan on doing this with my new 3GS when it comes in the mail tomorrow as well.  Here are some screenshots below.

Tethering Active over 3G

Notice under carrier: AT&T 5.0 (vs the normal 4.0)

Error sending, but all the features are in place.

Enjoy this at your own risk, I’m not responsible if you create an Apple Paperweight or rack up 5 grand in fees, but as far as I can tell, this seems like a harmless tweak.