Problem:
     - Couldn't install WhatsApp from Android Playstore.

Soution:
     - I personally faced this problem on my Samsung Galaxy W. The solution is very easy , Go to WhatsApp Official Download Page For Android and download the whatsapp APK. Copy this file to your Mobile and then, from setting >> applications check the Unknwn Sources . Navigate to the APK you've copied and open it and follow the installation instructions. Congratulations! Now You've successfully installed WhatsApp. Enjoy Chatting ....

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