So let me get this straight...AT&T offers a 3GB plan for $30 and a 5GB plan for $50, both with no tethering, so no advantage there by purchasing the 5GB. Both plans charge $10 per GB over your allotted plan, so why wouldn't everybody opt for the 3GB plan, and if they go over by 2GB, it would cost the same thing ($50) as paying for it in the first place!! This way you are not obligated to pay for more data than you are using (more or less). Am I missing something here??