Can you even get 3G data service from AT&T without first buying 'minutes' though? I can never seem to use up the minimum amount of monthly minutes so this has no bearing on my own monthly bill.
Yeah. And honestly, I think the person selling me the plan lied to me about the 400 minute plan being mandatory. (This is why I'm happy to see Amazon killing retail stores -- retail employees suck.)
There used to be, and maybe still is, a mechanism to activate your iPhone with an AT&T pay-as-you-go plan. The last time I had a pay-as-you-go it worked out to about $8/mo to keep up with the calendar based expiration of minutes.