Install blocked: Your android phone is set to block installation of apps / How To Unblock Settings

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How to allow installation of apps obtained from unknown sources: When you try to install the apps from unknown sources, the installation will be blocked and display the message "Install blocked. For security your phone is set to block installation of apps obtained from unknown sources". This is because the settings "Allow installation of apps from unknown sources" is disabled. Solution: Open settings and scroll down to select the option "Allow installation of apps from unknown sources".