"The iPhone was last year's hot device and now people are looking for something different," IDC analyst Francisco Jeronimo said.
However, Jeronimo believes next year, Android will grab the top spot.
Jeronimo expects this to change next year, thanks to Samsung's Galaxy S handset, which has already sold more than five million units.
"Samsung is gaining following the launch of the Galaxy S in the second half," he said, adding that the handset is seen as offering similar feel, function, and third-party applications to an iPhone for a lower price.
Jeronimo said Android has already become the second most-popular smartphone operating system worldwide, behind Symbian. He also said smartphones would make up nearly half (49 percent) of all mobile phones shipped in 2011, which is up on 35 percent in 2010.
See also: 12 apps to boost your Android smartphone