Is there an option in the Google Voice mobile app on smart phones that would allow it to automatically update Google Voice settings based on the phone's location?  Specifically, when I am home, I want Google Voice to ring my home phone as well as my mobile phone.  But when I am not at home, I don't want Google Voice to ring my home phone.  Same for my work phone.  If this feature does not yet exist, it doesn't seem like it would be too hard to add, and would be very useful to many people.