Hypothetically if your partner gave you access to the phone and you decided to snoop on it one day, other than pornographic stuff, evidence connecting them to a crime, or proof that they are cheating on you what could you find on their phone that would negatively affect your perception of him/her?

I know in dating we all value trust and authenticity, and I wondered even though no one has a right to view their partner's phone, even if you did, what could be on there that would make you sour on them, I feel like most people don't have anything that bad on their phone, and if they did they might have deleted it. It's kinda like when cops wanna search someone's phone, some people don't feel there is anything incriminating on there, so they aren't nervous about it.