Everything at AT&T is small percentages including the wireless & wire-line footprint for high speed reliable services.
All joking aside I see no real difference in the "two data plans". Data is data whether it is from a smartphone or a attached PC. Yeah PC data users use more data than smartphone but you shouldn't have to buy a separate plan, and if you are "forced to" like in this case, you should get more data than what is allotted to the smartphone.
You want to treat PC / Smartphone data separate, how about making separate plans for each rather than a carbon copy. Make it worthwhile to upgrade to tether.
That is not true. Some people use more data on their smartphones than on PCs and others use more data on a PC. Everyone uses their devices differently.
ATT sells service to a GSM device, how you use that device is not for ATT to dictate or limit. ATTs control ends at your antenna on the device that you 100% own. If ATT wanted to limit you they would have built their own proprietary network and leased you phones and not used GSM where you can use a phone that you 100% paid for. -- ...brought to you by Carl's Jr.