Hi sathish.hemadhri,
Just a side note: definitely be sure that you are also using a security product on those Android devices. There is a real increase in the amount and sophistication of malware for mobiles.
From The 2013 Internet Security Threat Report: Year of the Mega Data Breach:
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Mobile malware and madware invades consumers’ privacy
While many people download new apps to their mobile devices without a second thought, many malicious apps contain highly annoying or unwanted capabilities. Of the new malware threats written in 2013, 33 percent tracked users and 20 percent collected data from infected devices. 2013 also saw the first remote access toolkits (or RATs) begin to appear for Android devices. When running on a device, these RATs can monitor and make phone calls, read and send SMS messages, get the device’s GPS coordinates, activate and use the camera and microphone and access files stored on the device – all without the knowledge or consent of the victim.