How do i know if my iphone 6s has been breeched or hacked?

I had a warning 7 months ago that my phone has breached and hacked. In my mind its fake or a random pop up. So, i kinda brushed it off.
Today i had call from an older lady with southern American accent saying that I've been calling her everyday for the last couple of weeks. I have never called her or seen her number before until today.

Can someone tell me if my iphone has been hacked or breeched? If so how can i fix it?

Check your detailed phone bill for that number

You are in the process of being duped. Attempts such as this are as common as apple pie.

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