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!"
why would carriers advertise the ability? I mean they are in the market to make money. But I currently work for one of the meantioned carriers and it is as easy as asking "can I have sms turned off" and poof! it's turned off... this suit will go nowhere!