Grandpa used the Xiaomi Mi 8 mobile phone virus, open the next 7 antivirus software 6 network acceleration software, I found that the elderly with mobile phones, there is a function must be opened, that is, not allowed to install

Grandpa used the Xiaomi Mi 8 mobile phone virus, open after 7 antivirus software 6 network acceleration software, I found that the elderly with mobile phones, there is a function must be opened, is not allowed to install external software, but I clearly remember this software I closed, is not now a lot of rogue software or their own will crack this? Really heartbreaking, toss for a long time to get it right, in the future, if you want to choose the elderly machine, I think you can directly change the iPhone, even if it is the iPhone8 Plus is very good, at least there will be no such a virus situation, you say?