Another thing I heard floating around is AT&T will eventually switch everyone to either the $25 or $15 plans, and the $30 unlimited is going away, supposedly by September.
I just heard this from some people who just signed up for AT&T, I have not yet confirmed with AT&T, however I did ask them when I get my i4 next week, if my Unlimited plan stays intact and so far 3 of 3 reps said yes.
Only new customers dont get unlimited as an option, also if you switch, you can never switch back.
ex...
If I go from unlimited to $15 plan to save $, I will only have the option of going to the $25 2 GB plan, never to unlimited again.