Lets say I was just taking a walk or was in a train or a bus. I had to unlock my iPhone with passcode there and use the restriction passcode. Somehow a person saw me entering the passcode and I realised that I was watched and that was after a long time.
Can that person do anything like remote access (SSH, VNC) or something about encryption keys? Lets say that person has access to a backdoor to my cellular carrier & also knows my phone number (this means all my plain HTTP traffic, DNS queries, SMS, calls and other things can be seen, I am ignoring privacy policies here). What can that person do?