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iPhone security: How to improve it?

2018/10/5.  iPhone security: How to improve it?

I am not security professional about iOS or macOS.
But iOS is not secure OS, because it is too convenient…
Too convenient means it is not high security.

So I stopped about something on iOS.
(1)Bluetooth in public space:Bluetooth has security holes. So it’s not good in public space.
I usually use bluetooth for my headphone… (T_T) But I will stop it in public spaces… This may be not important...
(2)Air Drop:This is dangerous. Because someone can send you files by Air Play.
(3)Memo text:I have written blogs by iOS’ memo. But I deleted them all from iOS…

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