...available in many cities, the laptops support Verizon’s EVDO (Evolution Data Only) and Cingular’s HSDPA (High SpeedDownlink Packet Access) data transmission standards. Cellular modems cost about $200, plus the cost of service...
http://www.cio.com/article/19719
...With added technologies still in the works that include UMTS (Universal Mobile Telephone Standard) and HSDPA (High SpeedDownlink Packet Access), speeds reportedly increase to about 275—380 kbps. This technology is also known as W-CDMA...
http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm