There may be a situation you want to install apk files that you have downloaded from third party websites using your phone browser. But there is restriction in android that will disallow you to install that downloaded file.
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But happily there is an option to turn it off. Just follow the under mentioned procedures:-
1. Go to your Phone Settings.
2. Then Find Security Option and Click on it.
3. That's it, you have done turning off unknown sources. Follow the same procedure to turn it on again if need it.
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