How can I know if someone hacked my iPhone?
How to know if someone hack or spy on my device ( IPhone) ??
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"How can I know if someone hacked my iPhone?: How to know if someone hack or spy on my device ( IPhone) ??"
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About a Hacked iPhone:
Unfortunately, there is no way to determine if it has been hacked, unless you know that it has been hacked (officially called "jailbroken". And, the only way for an iPhone to have hacked is if it has been jailbroken.
So, what to do...
Resetting to Factory Settings:
If you are so concerned, then reset you iPhone to factory settings, as if you were to sell it. Go here: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. Perform as instructed there, including the backup creation and iCloud logout.