Google Play is an official app market that contains millions of different apps for Android devices.Samsung, HTC, Motorola and many other top manufacturers are using Android in their devices.By upgrading Symbian mobile OS, Nokia has made it capable to run smartphones efficiently.

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Nokia has remained a giant in the low-end mobile market, so after Java Symbian was the most used in the mobile phones till a couple of years ago.

Still Symbian is widely used in low-end phones but the demand rate has ben continuously decreasing.

Google then adopted the trend of naming Android versions after any dessert or a sweet in alphabetical order.

The other releases are Donut, Éclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich and Jelly Bean.

Symbian, which was once an industry leader, is also observing a diminishing slope.

IOS might continue to compete Android, and with the release of Windows Phone 8, we might see some healthy competition in future.

Apple i OS i OS was introduced in 29 June 2007 when the first i Phone was developed.

Since then i OS has been under gone many upgrades and currently the latest one is the i OS 9.

Above is the popularity graph, which represents last 12 months trends.