How can I scan for malware on an iPhone?

Apple's built-in defences prevent malware from affecting the unit and any scanners from checking files other than their own documents. If you upload a file and get told it has malware, delete it or check it on a computer.

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A non-jailbroken phone cannot be hacked, get a virus, or malware.

Ik this is a little late but how hard is it for a iphone to get a virus?

Read the answer from kb1951 above.