"A decade ago, there were fewer than 500m mobile subscriptions, according to the International Telecommunication Union (ITU). Now there are about 4.6 billion."
There has been an increase in land lines, but there only around a billion.
The revolution has taken over,
While mobile phones are everywhere, there are a lot of cultural differences. Americans talk (788 minutes per month each); Germans (89) and Japanese (133) not so much. Indonesians mostly text (averaging 1000 text messages per month).
With the advent of smartphones, it's difficult to see where the evolution ends. When I bought my first PC in 1982, I would not have guessed that I would be mostly using this "personal" device to connect to the World Wide Web, watch videos, and deal with e-mail. Smartphones are even more difficult to predict.