Sure, I'll take the $30 Unlimited...wait, it's not Unlimited anymore!?

AT&T couldn't find a way to make their network any faster, so they went and did what they felt [as a corporation] was the next best thing: they removed the Unlimited Data usage add-on plan for their smartphones. In its wake are two "simplified" plans that are supposed to make things easier to understand and use for the majority of their customers - the DataPlus plan, which provides 200MB of data usage per month and the DataPro plan, which provides 2GB of data usage per month. AT&T states that 98% of its customers who use the Unlimited smartphone data plan do not exceed 2GB per month. Could they just be blowing smoke and forcing customers to move to data plans that are unnecessary? Possibly. However, AT&T is letting customers who currently have the Unlimited data plan stick with it indefinitely, unless they want to add data tethering to their smartphone. Adding tethering requires the DataPro plan, which means bye-bye Unlimited data plan. Oh, Unlimited Data plan, It's been a great journey and we hope to see you again, one day. Sadly, we know that day will probably never come.

Sources: Wired, IntoMobile