WhatsApp

WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.
 In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.

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Cricbuzz

Want to know the latest Cricket score? The best way is Crickbuzz! Its free and really easy to use too. You can even know about any player carrier statistics.

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Ragging Thunder II

Ragging Thunder II is a really cool car racing game. It will take you through abandoned temples, tropical beaches, snow-covered mountains, the Great Wall and a range of other breathtaking vistas the world over!

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Facebook

The official application of the largest social network site.
Keeping up with friends is faster than ever.
• See what friends are up to
• Share updates, photos and videos
• Get notified when friends like and comment on your posts
• Text, chat and have group conversations
• Play games and use your favorite apps

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Temple Run Oz

Disney and Imangi Studios present Temple Run Oz – a brand-new endless runner inspired by Temple Run 2 and the film Oz the Great and Powerful. Play as Oz and outrun the shrieking flying baboons as you turn, jump and slide your way across the land. Begin your exhilarating adventure now and see how far you can run! In Google App Store it is not free, but here it is absolutely free of cost!

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avast! Free Mobile Security

avast! is the best free antivirus available in the Google Play Store. Even some paid antiviruses can't do the job of avast! Protects you from malicious attacks and helps you locate your lost or stolen device. Rated 4.7 of 5 stars in Google Play store!

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From where to Install Applications?

Android's biggest App Market is Google Play Store. You can download a lot of verified apps from this, in other hand you can download E-Books, Films too!

But sometimes in-store apps they are not free, in that case you can simply search google for its .apk file and install it. Before installing .apk files from 3rd Party Websites you have to insure that 'Unknown sources' button is checked! To make it happen go to Settings > Security > Unknown sources