Traveling around town without a broadband connection for your laptop can be a hassle. But with the help of a USB modem -- a gadget that connects to your computer's USB port and uses your wireless carrier's broadband cellular service -- you can perform nearly any online task, as long as you're in your carrier's coverage zones. And, assuming you stick close to main roads and don't venture off the beaten path, you should have good luck connecting.
To get a feel for some of the top services and products available, I evaluated the Sierra Wireless AirCard 881U on AT&T's 3G network, the Novatel USB727 on Verizon Wireless' BroadbandAccess and NationalAccess networks, and the Sierra Wireless Compass 597 on Sprint's Mobile Broadband Network.
I compared each device's design, installation process, speed (using Speedtest.net), and general usability to determine which is best for the person on the go. And although each had attributes that made me cringe, I was generally pleased with their performance and believe they're all worthy of your use -- as long as they work wherever you're going.
http://www.informationweek.com/news/mobility/reviews/208404374
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