I just ordered it online via EPRP. The premium data can be unchecked, but when you go to the next step, you get a warning that the data plan you selected won't work with the phone. You don't have a choice really.
Still, not bad - with equipment protection, it comes to 76.99/mo. Still cheaper than my current iPhone plan (84.99/mo) - yeah, 8 bucks cheaper a mo.
The diff? Sprint is unlimited everything, and 500 min land line calls with 7pm nights. Also I get insurance for the phone.
AT&T, the price I pay only gets me 1500 text (practically unlimited for me), 450 anytime minutes (but a crap load of rollover minutes from 12 months I was with them), 9pm nights, and no insurance (none even offered).
Yeah... sprint is a better deal.

I just hope the EVO 4G is all that its cracked up to be. I'm not against paying the $120 ETF for AT&T (prorated) if all goes well.
I'm going to give Sprint the 30 days, and hopefully the iPhone 4G will be available before it's over so I can give that a try before I have to make a final decision on which phone/carrier I want to be on.
Good luck to all!