Verizon 1xEV-DO WWAN
From the TABOOK.PDF reference (Lenovo Training Solutions, Personal Systems Reference, November 2005 Number 299):
Some models: Wireless WAN Sierra Wireless 1xEV-DO Network Adapter, Mini PCIe Adapter, EV-DO/1xRTT, WWAN antenna on display, service contract reqd with VerizonÂ® Wireless.
WWAN: Requires service contract with Verizon; monthly service charges and airtime charges will apply. Roaming charges may also apply. Service not available in all areas. Verizon, not Lenovo, is solely responsible for the Verizon Wireless service. Visit the following Web site for more information: www.verizonwireless.com.