Google's Sundar Pichai said at the Mobile World Congress that Google will announce in a few months their plans to become a MVNO wireless service. Think at Goggle I/O which is the last week in May for this announcement. Google has told AT&T and Verizon that Google has no plan to become a cell phone service at scale and will partner in the USA with current Wireless companies that will share their spectrum and cell towers. Google is looking at proving cutting edge technology for everyone to implement that technology around the world. Google will split the revenue with the Wireless partners around the world. Google has very ambitious technology goals of adding "Floating Cell Towers in the Sky" with Google's Project Loon (balloons) and Project Titan (planes). Earlier reports said that Google struck a deal with T-Mobile and Sprint to resell wireless services on their networks, essentially making Google an MVNO (mobile virtual network operator).
MWC: Google Talks Projects Titan, Loon And Becoming An MVNO
MWC: Google Talks Projects Titan, Loon And Becoming An MVNO