It may come as a shock to some of you, but smartphone users really do still make phone calls. Albeit, not nearly as much as they used to, but it isn't a feature that is going away quite yet. Or is it? Probably among some users, it is. With alternatives like Skype, Google Voice, and others, there are ways to not use any minutes and only data.
So why pay for minutes you're not using? Well, AT&T's CEO agrees with you, at least partially. Phone companies make a large majority of their money off of texting and minutes as the calls and texts don't use very much data. This is a prospect that they don't to let go of. But change is inevitable and going to data-only plans is the next logical step in wireless evolution.
Randall Stephenson said at an investor conference in New York on Friday that he'd "be surprised if, in the next 24 months, we don't see people in the market place with data-only plans." In this scenario, phone calls would just be considered another form of data. They basically are right now, but the company just bills differently for them.