Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
I don't understand why everyone is thinking this will "activate" MMS (its all over BGR too) - Ive got a 3GS (on O2 UK) and when I set it up the first thing I got was an MMS saying everything was set up, and I've since sent and received MMS pictures to my girlfriend.
So as far as I am aware - MMS is "activated?"