We protect a smartphone from a virus

I am afraid whether I can use the smartphone safely.
I teach a laborer using the smartphone safely! You can ask me anything.
Where does the virus come from?
(1) When you read a site infected with a virus on the Internet.
(2) When I downloaded application.
(3) When I opened the links such as email or SNS.
It is infected with a virus at such time.
What does the damage of the virus?
A large amount of money is demanded, and a call is listened in on, and it is enrolled in paid service without permission, and so on.
What should I do to prevent a virus?
It is important I discover it by virus measures software, and to prevent damage and that it is thoughtless, and the attached file of the email and the unidentified URL do not open.
What is there the virus measures software?
There are "Trend Micro virus buster cloud" and "ESET Smart Security" and "McAfee Internet security"


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全国中学高校Webコンテスト
全国中学高校Webコンテストに参加しています。