"Gobi is the mobile broadband technology that connects your laptop to the Internet via 3G cellular networks around the world.
Gobi is the first built-in, 3G modem with the ability to connect you to both EVDO and HSPA cellular networks using a single embedded device."
Instead of choosing a laptop because the module inside
is with Sprint, AT&T, Verizon, etc; choose one with
Gobi and then decide which provider to activate with.