3G iPad Plan Explained

"Since Apple posted information weeks ago with preliminary details about the data plans for the 3G iPad - arriving on doorsteps on Friday - available from AT&T in the United States, I've been wondering about what either company meant by 'month.'"

I'd always assumed it meant 30 days, so I guess I assumed right on this one. You can check out the AT&T data sheet here, but it basically is a 30-day cycle that starts whenever you purchase the plan. As reported before, they are offering two monthly plans, one is a 250 MB plan for $14.99USD and the other is unlimited data for $29.99USD. Once you start them they renew each month unless you cancel them. If you upgrade from the 250 MB plan, your "timer" starts when you pass the 250 MB limit or when the 250 MB plan ends, whichever comes first.