AT&T recently introduced a capped data plan for iPhone, iPad, and other smart phones
I see some progress, but also some old thinking. Unlimited data is a thing of the past. Bravo. Everybody knows this was an unrealistic model that is in conflict with the increasing demand for data services. There is a practical limit on how many minutes a person can talk in a month. There's no obvious limit on how much data a person can use. To charge per minute for talk, and offer unlimited data makes no sense.
Tethering is $20/mo extra. That's disappointing. Now that you are charging for the amount of data actually used each month, there's no inherent justification to charge extra for tethering. It looks like a money grab.
If I want to use tethering to handle my Email a few times a year because I prefer the larger screen and keyboard of my laptop, AT&T says no dice, that will be $20/month extra. That doesn't leave me feeling warm and fuzzy about our relationship. It feels like you are charging extra for something that doesn't cost you any more to provide.
If you eat the bread with your left hand, it costs $25 per month.
If you eat the same bread with your right hand, it costs $45/month.