How to fix Install blocked. Allow installation of applications not obtained from Google Play

Описание: When i try to install WhatsApp.apk file in samsung galaxy mobile using Android Package installer, i am getting the message "Install blocked". For security, your phone is set to block installation of applications not obtained from google play.
Solution: Go To Security settings from your Android mobile and enable the option "Unknown Sources - Allow installation of apps from sources other than the play store". Now, you can install the apps from any source without getting blocked by your phone.
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