To the OP: Sorry OP means the original poster. It’s not unusual that you are unfamiliar with SSH or anything else mentioned.
Those things all do sound like they warrant further investigation. It can be really tricky to locate something improper on a device and know for certain that it shouldn’t be there and many people struggle with finding problems and do whatever it is that needs to get done to fix them.
If I were you I’d take your phone to the Genius Bar and talk to them about your concerns. Obviously if they try to dismiss them as impossible just ignore them and don’t let it upset you. Instead focus on the specific things you mentioned here how your security checkup says “unable to gather information.” That’s not normal but it’s not conclusive of anything either way.
Tell them you’re concerned about your Wi-Fi settings bc it describes them as “managed”. btw do you live in a community where Wi-Fi is provided to a large area or comes from more than a single Wi-Fi router that you have somewhere in your home? That could explain the term managed but still it’s good to be on the lookout for that type of thing.
For your audio and camera being used are you also seeing a red green or orange dot appearing in the corner of your phone or do you you find the camera app open or something? Your iPhone may be set to revert to last used settings when you reopen the camera app so you may want to turn that setting off to see if that stop the filters from behaving unusually. If not I’d have the camera looked at.
There are dozens of other things that you could do to investigate this but in general you should always calmly approach such problems and start from the most common and easy to fix possibility like simply adjusting a setting before trying to ascertain the much more difficult question of if your phone has been accessed without your permission. I say difficult because when that does occur whoever did it probably has some interest in not getting caught so evidence may be deleted or hidden from you anyway. Either way just because you can’t prove it doesn’t mean it didn’t happen.
If you are really concerned that your phone has been subject to some sort of unauthorized access you can always back up your data then perform a factory reset of your phone.
