I hate it
How to know of my iPhone. 5 is being hacked?
What kind of hacking? If you mean as in somebody breaking into your phone, this is what you do:
You can go to your phone company and they can give you your phone records. If anything looks different, you've been hacked.
Next time you open your phone to the home screen, double click to see what apps have been opened. It will show on the bottom of the screen. If you don't recall opening those apps in the past, you may have been hacked.
Also change your password.nobody will be able to figure it out.