What do you think about me going through my dad's phone and seeing photos that were taken secretly?
Why did you go through your dad's phone?
Because I was suspicious of him, he has been acting so oddly.
It wasn't right for you to go through your dad's phone. Don't go through people's things if you don't have their permission to do so.
You said it yourself in the rule. You can look at anyones phone without them knowing.
No you can't, and I'm not sure where you heard that rule? You should never look through someone's phone if you don't have their permission and people will look down on you if they find out you're doing that.