The number of smartphones sold each year will increase from around 165.2 million in 2009 to 422.96 million in 2013, with the total number of smartphone users approaching 1.6 billion, according to Wireless Expertise, an UK-based wireless market research and consulting firm.

Its latest report “The future of mobile application storefronts” shows how smartphone penetration will reach approximately 28-30% of the total mobile market by 2013.