There are a vast number of differences between them but I'll give my own view on each:
Android is pretty much the best mobile OS there is, it's fast, flexible has great support for customisation, a pretty decent app store and it's becoming
Sergey Brin and Steve Horowitz discuss the availability of the SDK, that it will be open source in the future, and demo applications on the ...
The availability of ICS source code is especially significant because it marks the first time that Google’s tablet code has been opened to public scrutiny. Google previously withheld the source code of Honeycomb, the company’s tablet-centric version of the operating system, and only provided access to select partners. That disappointing move prevented the independent Android community from building custom ROMs for devices like the Motorola Xoom.
Google contended that corners were cut during Honeycomb development and that the software was held back because it was unsuitable for widespread availability. The decision to unilaterally withhold access to source code for competitive reasons undermined the company’s early claims about the extent of Android’s openness.
The Honeycomb source code is technically included in today’s ICS code drop, because ICS was developed on top of the Honeycomb code tree. Google has not actually tagged the specific Honeycomb releases, however, in order to discourage third-party developers from creating Honeycomb builds of Android.
Smartphone Shootout: Google Nexus S Vs. Motorola Droid 3
Operating System: Both the phones run Android 2.3 or Gingerbread juice, but Nexus S is considered to be the first phone to run Gingerbread. However, they optimize the OS with their own UI. Droid 3 ships with Motorola's Blur UI.
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Apple iOS versus Android
Earlier this week Apple won a significant patent claim against HTC, one of the main proponents of Google's Android OS. The win, over two software-related patents, positions Apple to go after other handset makers that use similar technologies.
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Analyst: Nokia-Microsoft collaboration 'unlikely to be successful'
Facing stiff competition from Apple and Google, Microsoft started from scratch with the new mobile operating system, which launched last fall. And while the Windows Phone app store has steadily been growing, its user base has not.
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Scoop: Oracle scrubs site of embarrassing Java blog
The database software giant is suing Google for allegedly infringing on its Java patents in the Android mobile operating system. Now, quietly, Oracle has removed all the blog posts of former Sun Chief Executive Jonathan Schwartz from its Web site,
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Worthy Rivals for the Crown in Smartphones
During the years since I'd bought the Pearl, an array of new devices using the Google Android operating system had appeared, and Research in Motion had introduced several new BlackBerry models. Limiting the original iPhone to AT&T subscribers brought
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Developers Hot for Amazon Kindle Fire, Windows Phone: Survey: 3 mobile operating system behind iOS and Android. ... 
Daily Mobile takes a look at Illyriad on Android and iOS. Check it out here: 
The _Symbian_ operating system (OS) is utilized by many various mobile phone producers for their smartphones,... 
Motorola Defy is a full touchscreen mobile phone with Android operating system.
Illyriad: A Great Multi-Platform Game for Android Cell Phone Operating System and iOS: News from DailyMo... #Mobile
droid pumpkin - carved while watching the yankees get blown out in game 1 of world series.
Giant Android robot at the Googleplex, Mountain View, California.
