How to enable MMS on iPhone OS 3.1
If you check out our iPhone forums, then you’ll notice the thread “MMS is out right now” is blazing hot. Thanks to this tutorial, several forum members have reported success enabling MMS on iPhone OS 3.1 using either iTunes 8.2.1 or even iTunes 9. The process does not require you jailbreak your iPhone. It does require downloading a modified bundle file (available at Krllr), but the process seems easy enough and most are having success.

For those willing to wait, the official launch of MMS on AT&T is set for September 25th. If you enable MMS, let us know how you make out in the comments or in our forums.

Not just for 3.1, works on 3.0.1 too
i have a jailbroken 3.0 with 5.0 carrier settings done awhile ago. i just checked to see if my mms works yet and it does!!! im in Arizona. Finally!
Dosent work in wv
hey i just thought i would let everyone know. today when i plugged my iphone into itunes it said my current firmware was 3.1. the weird thing is i never upgraded to 3.1 my phone actually upgraded itself it is also still jailbroken . also i am now able to send mms which i shouldnt of been able to do until the 25.so to conclude i have A SELF UPGRADING IPHONE WITH 14 DAY EARLY MMS AND RUNNING 3.1 AND STILL JAILBROKEN. Please write back. I want to hear everyones opinion.
I’d update the title - this works not just with 3.1, but with 3.0 also…
it worked i could enable mms
but after 1 hour it didn’t work !
I installed the modified file, and IT WORKS !!!
I HAVE MMS !!!!!!!!
what file did you install