Android has a large community of developers writing applications ("apps") that widen the functionality of the devices. Google can download from third-party sites to through online stores such as Google Play (formerly Android Market), the application store run developers write primarily in a customized version of Java Applications In June 2012, there were more than 600,000 applications available for Android, and the estimated number of applications downloaded from Google Play was 20 billion.
Android became the world’s leading Smartphone platform at the end of 2010. For the first quarter of 2012, Android had a 59% Smartphone market share worldwide. At the half of 2012, there were 400 million devices activated and 1 million activations per day. Analysts point to the advantage to Android of being a multi-channel, multi-carrier OS.
iOS is better smart phone platform, it has great features and many more, but for a jeepney commuter an apple phone (which iOS run) is a very expensive phone. Not all commuters can afford this.
Symbian OS because of the advancement of technology, the Symbian was left behind by android and iOS.
According to Zach Epstein (May 24th, 2012) Android finished the quarter as the overall leader among the mobile operating systems, accounting for more than