What's going on with my IPhone 5s is it a bug, hacked, or unnatural things?

My IPhone 5s types and calls on its own sending weird messages to my friends and calling. When it calls my friends my friends tell me it's heavy breathing for a couple of minutes and then it cuts off someone please tell me what's going on I'm actually scared right now

If you have any concerns its easy with an iphone to just set it back to factory. I doubt if there's an issue but if concerned just do that, problem solved.

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