In the past GrandCentral has had a restrictive policy that prevented two GrandCentral subscribers from sharing the same forwarding number.  For example, My cell phone and my wife's cell phone pointing to the same home phone number.  I am not sure why GrandCentral didn't want to allow this functionality but it always annoyed me.  Now it seems that have listened to their customers.

We’ve had a lot of requests in the past to be able to have two accounts share a forwarding number.  There were a lot of internal reasons for not allowing this…however the voice of the user has been heard and we’re changing our policy to accommodate all of you who are married or otherwise share a home with another GrandCentral user.  Now you and your roommate, spouse, dog, etc., can both have the same home number ring when somebody calls either of those GrandCentral numbers.  GrandCentral Blog

So it seems that sometimes, just sometimes, companies listen to their customers.  Great job GrandCentral.  Just another excellent reason why I have been using this service for over 7 months!