the Evil Line

Almost two years ago on this blog we heard a prediction from mathematician Keith Devlin:

Within my lifetime I fully expect almost every living human adult, and most children, in the world to own [a mobile phone].

Now The Economist reports that we're halfway there:

Sometime in the next few months, the number of mobile phones in use will exceed 3.3 billion, or half the world's population.

"Halfway there" is also the theme of a recent funny post from another mathematician.