The great thing about Google is that it scares the heck out of practically everybody in a wide range of IT and media businesses, and it looks as though the phone companies could be next to feel the heat. Google is already in the phone business with its Android software, which delivers customers to Gmail, Google Maps, and other services while opening up the potential for zillions more profitable advertising opportunities. Now the Big G’s blog has officially bought Gizmo5, and its team will join the GrandCentral acquisition now known as Google Voice…