If Google sticks to their "do no harm" policy, then I hope they deploy their own cell phone and wireless data networks and stomp the other over-charging carriers into the ground.
Especially if they deploy WiMAX on the same towers.
700Mhz freq for voice and 2.5Ghz for WiMax data.
Of course, Sprint and Nextel have pretty much locked up 2.5 Ghz so Google will have to deal with them, probably nothing more than a WiMax roaming agreement.