Is hacking iPhones possible?

Some one today who I was chatting with on whatsapp and viber, n whom I only met in a very long time, said that he could hack my phone. I'm using the latest version on iphone5. That person only knows my number. Nothing more than that. Is that possible? And if that was to be true, would I be able to notice any difference? Please let me know.

The person is a troll and can't "hack" you with just a phone number. I wouldn't worry about it.

There's nothing he can do. He just likes to talk big.

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