A new study by Informa found that there are more than 3 billion SIM cards in active rotation, which means that lots of folks have more than one SIM card and that there are seriously lots of phones out there.

I mean think about it: 3 billion mobile subscribers. That’s an amazing number, a world changing number. That’s 3 billion people who had almost no way of connecting to the outside world in developing countries can now plunk down a few bucks for a prepaid phone and get market prices, call mom, and generally become another node in an interconnected economy and culture.

Global mobile subscriptions hit three billion [TheRegister]