Is going through your partner's phone a recipe for disaster?

Do you believe that in most cases you will find something unsettling if you go looking for it? And does this just mean that nobody is perfect, or that everyone is deceitful? Would your partner find anything uncomfortable in yours?

Updates
4 mo
I meant going through their phone with their permission, some people are okay with sharing phones
Is going through your partner's phone a recipe for disaster?
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