How many mobile phones have been sold in last three years?

Worldwide sales of smart phones to end-users reached 38.1 million units in the fourth quarter of 2008, an increase of 3.7 per cent over the same period in 2007, said Gartner. However, sequential growth slowed down, added the US-based research firm. Global sales of smart phones for the year 2008 reached 139.3 million devices, up 13.9 per cent compared with 2007.