The top end smartphones have cameras that are at least good enough to replace casual point and shoot cameras. Their excellent quality is worlds apart from the new Nokia phone's camera. While the vast majority of people use smartphones for calls, sms, and the camera, there is huge growth in mobile based purchasing, gaming, and social network usage. There are lots of different things that people do with smartphones, maybe not everyone uses the same app or game, but the flexibility of the smartphone makes it possible.

Do you know any professionals? Everyone I work with uses calendar/agenda features...

While this seems to be a battle of anecdotes, everyone I know who owns a smartphone uses it as their primary non-work email device, Facebook device, browsing device, LinkedIn device, etc. Many home personal computers no longer get turned on. It isn't a cell "phone" as much as it's simply a portal computing device.

Facebook reports 78% of US daily users are mobile [1]; Twitter report 75% of monthly active users have used mobile [2]; and Amazon report 60% of customers shopped with a mobile device during the Christmas period [3].

Admittedly these headline figures appear to count users with any mobile activity, even if they have far more activity from other platforms.

I prefer desktop too, but I think it's a mistake to underestimate mobile.

[1] http://techcrunch.com/2013/08/13/facebook-mobile-user-count/

[2] http://techcrunch.com/2013/10/03/mobile-twitter-161m-access-...

[3] http://techcrunch.com/2014/12/26/amazon-2014-holiday-sales/

To counter an anecdote with an anecdote, almost everyone I know uses their phone more for Facebook/Twitter/Hangouts/Snapchat/etcetcetc than for SMS (and I can count the actual calls I've received in the last month on... 2 fingers).