First of all, it’s not the tool to use laptop to call, but the latest wireless technology WIMAX that Centrino 2 technology provides.
We could see there’s an extra WIMAX indicator light under the T400 screen.
 
Now let’s talk about what is WIMAX:
WiMAX（World Interoperability for Microwave Access）is a wireless MAN technology based on IEEE802.16 criterion.
WiMAXzz began establishing criterion since 2001 and authenticated the chip and device. Scale-economic made it possible to lower down cost, and WiMAX application scope also expanded.
Now WiMAXzz includes chip manufacturers (such as Intel), device providers (such as Alcatel), telecom operators (such as BT England Telecom), the industry chain is already quite complete. So far there’s numerous experiment network with the global, and the device according with WiMAX criterion could be used for commercial usage, and large-scale application was already carried out.
WiMAX has an outstanding speciality compared to WiFi: further covering radius.
WiFi could primary solve the wireless connection problem within 100 meters, which belongs to WLAN scope. At widen places, WiFi could reach 300 meters at most, and in the room generally the valid covering range is within 100 meters. However, WiMAX could reach about 50 kilometer covering range at most, which belongs to WMAN scope. And the classic applied covering range is 6-10 kilometers. Compared to 3G, it provides bandwidth less than 2M. and each WiMAX station could divide 6 sectors at