Hacked iphone

Applications, Device Management, or otherwise do not have the permissions necessary to be able to listen to your phone calls. As long as your device is not Jailbroken then you should have no reason to worry about phone calls.

As far as your Photos and Videos they can be accessed by Applications that you have given permission to, and they may additionally be backed up to iCloud.

Therefore I would:

• Check for unknown Applications
• Check where your Apple ID is logged in
• Reset the privacy exceptions in Settings>General>Reset

These are just some things to start out and absolutely will not cover everything. But there is a million possible answers and to be absolutely sure you should contact someone that knows what they are doing to have a look through your device.

See this article:

https://support.apple.com/en-us/HT204145

A non-jailbroken phone cannot be hacked. if You think your Apple ID was compromised, change your password.