Mobile economics

I fondly remember my first mobile phone – large and clunky with a short battery life, but it could make calls. My current mobile phone, in contrast, probably does make calls (I cannot remember trying, but it must be there somewhere), but it is very good at emails (several sent today on the way to work), web browsing (traffic news checked before commuting) and by and large it is true that, whatever I want, there is an app for it.