So 10 days ago AT&T dropped the ball when they dropped their new unlimited data plan. The plan itself was more expensive than any of it’s major competitors at $100, the plan also didn’t have mobile hotspot for some reason. AT&T did fix the plan by dropping the price down to $90 and including 10GB of Mobile Hotspot. The biggest downside is that you get throttled after 22GB are used. 
The company also rolled out another version of the plan that’s cheaper and not nearly as good. The plan gives you unlimited 3G and no data for a Mobile Hotspot, you also don’t get HAD video only SD (480p)