Idk why you're downvoting the guy WetBeardHairs is right. Pegasus spyware has been a serious threat and was created by a nation state hacking group in Israel called NSO group.

This is why I do the best I can and use GrapheneOS, but there could always be some security vulnerability deep in Android itself. If you're looking for true privacy and security, a burner or something with removable components would be best.