I have to throw my cards in with the why bother crowd. When I needed one it was either provided by my employer or I used a cheap pay as you go phone (like the phones from Virgin Mobile).
But frankly, I don't like being available at all times or being a slave to my phone. And texting? Far too torturous on my finger. Smartphone functions? A phone's display is too small. I might consider a 7" tablet, but a phone display? My eyesight isn't that good.
And I'm sure there are mobile phones with as high a resolution as my digital camera, but I doubt they have optical zoom.
I'll leave these easily lost or destroyed toys to those of you who favor them.