This excerpt taken from the VZ 10-K filed Feb 28, 2008.
Our primary network technology platform is CDMA, based on spread-spectrum digital radio technology. 1XRTT technology is deployed in virtually all of our cell sites nationwide. In 2004, we began deploying EV-DO (Revision 0), a 3G packet-based technology intended primarily for high-speed data transmission. In 2007, we expanded our EV-DO footprint, covering a population of approximately 242 million as of December 31, 2007. In addition, we deployed EV-DO (Revision A) throughout this footprint, which allows for even faster data speeds than Revision 0.
We plan to develop and deploy our fourth generation mobile broadband network using long term evolution (LTE) technology developed within the Third Generation Partnership Project standards organization. We believe that LTE will provide us with a unique opportunity to adopt an access platform with global scale and compatibility with other technologies. The technology is designed to deliver mobile data networks with higher speed and throughput performance, lower latency, improved efficiencies and global roaming.