Smartphone sales will increase by 57.7 percent in 2011, analyst firm Gartner has predicted, with Android accounting for the lion's share.

iOS will account for 19.4 percent of the market by the end of the year, with Android nearly doubling this figure with a 38.4 percent share.

Android will go on to dominate the smartphone market with a 49.2 percent share by the end of 2012, whereas iOS will slip to 18.9 percent, according to Gartner's figures.

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By 2015, Android will still dominate, though Microsoft will account for nearly 20 percent of the market by then, ahead of iOS on 17.2 percent.

"By 2015, 67 percent of all open OS devices will have an average selling price of $300 or below, proving that smartphones have been finally truly democratized," said Roberta Cozza, principal analyst at Gartner.

"As vendors delivering Android-based devices continue to fight for market share, price will decrease to further benefit consumers. Android's position at the high end of the market will remain strong, but its greatest volume opportunity in the longer term will be in the mid- to low-cost smartphones, above all in emerging markets," she continued.

RIM is likely to see its market share slide from 13.4 percent at the end of this year to 11.1 percent in 2015, but the biggest loser will be Symbian.

Currently Symbian has around a 37.6 percent share of the market, but this will halve by the end of 2011, Gartner predicts. By 2015, it will account for just 0.1 percent of the market.

This is due to Nokia's decision to back Windows Phone 7, which explains the boost that Microsoft will see from 4.5 percent in 2010 to 19.5 percent by the end of 2015.