Could people track the iPhone when its off?

Could people track the iPhone when its off?

The only way to ensure you can't be tracked is to remove the battery. Obviously that presents a problem.

Probably not, but with the way the technology is now it wouldn't surprise me if someone was able to hack into it even while it was off. I would say generally no, but I wouldn't bring it somewhere if you don't want to be tracked for whatever reason.