Google provides an interesting foil to AT&T. They both have/had effective monopolies over a telecommunication sector and large research operations. However, the differences are quite large. Google has not funded basic research on the same level as Bell Labs. It also is more keen to productize the research it does. Additionally, its monopoly is part of an ecosystem of services on the internet and is not as complete as Bells dominance over telephone lines.
Read Tim Wu's "The Master Switch" for a much more complete history of Radio, Television, Film, Phone and Internet communication companies in the USA. It's a fantastic read and provides the background for intelligent conversations about the telecommunications industry.