>That would be a neat trick - I haven't heard of anyone being able to find a way to do that on the iPhone, so whoever it is that says they figured it out would be a very popular person as this seems to be a common request. Android of course is a different story.as it's been done a zillion times.

I have heard it was from iPhone 5s. Maybe it is supported on iPhone 5. IAC, this works with the GPS locator. So, the zone is defined, usually around the house, and that does the trick.