Hi Security is a world class antivirus and security application ( App Lock & Booster ) for Android devices used and enjoyed by million android users globally and .\rbr\rbrHi Security is a world class antivirus and security application ( App Lock & Booster ) for Android devices used and enjoyed by million android users globally and .\rbr\rbrHi Security is a world class antivirus and security application ( App Lock & Booster ) for Android devices used and enjoyed by million android users globally and .