Hi,
is in unity some function that does check when you are looking for the phone?
Somethink like check your head is away from ‘area’ of camera 
Unity doesn’t have anything built in for it.
But the corresponding phone’s native library ‘might’ have something. I’d search for that. Note this could vary heavily from platform to platform… so maybe iphone has something, but android doesn’t.
Thing is I’m willing to bet there isn’t some simple “IsLookingAtPhone” function out there… but that there is a series of tools that could be used to decipher such a thing.
Thanks a lot for this research