Some people believe, perhaps rightly, that mobile devices don't consume very much bandwidth and therefore AT&T can afford to give us "unlimited" data plans, but not free tethering. After 1 week of use, my new iPhone 3GS has already received 2.8GB and sent 298MB. At this run rate, a tethering limit of 5GB per month would be practically worthless.
How much data have you consumed?
How much data have you consumed?