I was reading GigaOm Pro's Global Mobile Subscriber Forecast and noticed that by 2015 the world will have quite a few more global mobile phone subscriptions than people.
As the chart below shows, GigaOm is projecting that there will be a bit over 8 billion global mobile subscriptions in 2015. The UN is currently projecting global population in 2015 to be about 7.3 billion.
BTW, I'm a big fan of GigaOm Pro. The content is excellent. I've been a paying subscriber since they started and it's a steal at $299 per year.