Can a magnetic case harm my iPhone? I am thinking about buying a magnetic iPhone 4S case but I'm not sure whether it's safe. Can this magnetic case be harmful for the inner parts of my iPhone 4S? The case looks exactly like this:
The storage on a 4S is Flash-based, not magnetic-media-based, which would be my prime concern in a scenario like this—so you're safe there.  I'm not aware of any other components in the 4S that would be affected by a magnetic case.  I have personally carried my own 4S in various magnetic cases for about a year now with no ill effects.