
In addition to details posted last month by Apple on how 3G data service will be managed on Wi-Fi + 3G iPad models due for launch this Friday, AT&T has now published a fact sheet (PDF) offering additional information on iPad data service.

AT&T notes that its "monthly" domestic service plans actually consist of 30-day cycles that will automatically renew unless the customer elects to cancel his or her contract-free service.
Users on the 250 MB plan will receive alerts when they reach 20%, 10% and 0% of their data limit remaining. Customers who reach their data limit for a billing cycle can either wait until the end of the 30-day cycle when it automatically renews or change to an unlimited plan, which will begin a new 30-day cycle at that time.Once you sign up for iPad 3G data service, you can add to or cancel your domestic plan at any time - no penalty. For domestic plans, if you do not cancel, your service will automatically renew every 30 days to provide a more seamless data experience on an ongoing basis. For example, if you activate service on May 9, your service will automatically renew 30 days later with the same plan. If you do make a change, a new 30-day window begins.
AT&T's iPad data plans are priced at $14.99 (250 MB) and $29.99 (unlimited) per 30-day cycle and also provide free access to the company's network of over 20,000 Wi-Fi hotspots.
Article Link: AT&T Posts Fact Sheet Regarding iPad 3G Data Service