Cingular Wireless...
BellSouth
SBC
Pretty much 5 companies within the SBC infrastructure.
Guess what? Using T-Mobile partner sites for GPRS and GSM Network)

Verizon Wireless...
AirTouch
PrimeCo
Verizon Communications
Vodafone
(Partner contracts with Cingular and AT&T Wireless during Analog Mode)

Moobak, those are your facts.
Maybe hard to swallow, but are true