10 Times More Smartphone Users and App Store Sales in 4 Years?

There will be 970 million smartphone users by the end of 2013, up from 300 million in 2010, according to analysts at research2guidance, a Berlin-based market research firm. In 2009 there will only about 100 million smartphones in use.

As a result,  annual app revenues will grow from $1.94 billion in 2009 to $15.65 billion by 2013.

An order of magnitude growth (roughly 10 times) in users and app store sales in four years would be steep, indeed.