One number. One voice mail box.
Google obviously thinks that this concept is something people are going to want as they have just acquired Grand Central.
What is it? Put simply, Grand Central is a single number that ties any and all your phone lines together. Mobile, home or office, all of them ring when your Grand Central number is dialed. It also provides more advanced features such as call blocking, call recording and the ability to define which phones ring depending on who is calling.
Currently, this is still in beta and requires an invitation to get setup so click here to reserve a number for when it fully rolls out.