I believe that my elderly aunt, with dementia, has her late DH's phone somewhere in the house. It won't have any charge in it though. Can I reasonably assume that a phone that is switched off and out of charge won't be affected by this?
It would definitely upset her if it went off, but I doubt she'd even know where it is and she certainly wouldn't manage to change the settings by herself. Presumably, if the phone is dead, it's dead?