Cell phones have existed for decades, but only recently have cellular networks evolved to become a mainstream form of wireless Internet service. With an installed cellular network adapter, or by tethering a cell phone to a laptop computer, Internet connectivity can be maintained in any area with cell tower coverage.
Older cellular communication protocols allowed for only very low speed networking. Newer3G cell technologies like EV-DO and UMTS promise to deliver network speeds closer to those of DSL and other wired networks.
Many cellular providers sell Internet subscription plans separate from their voice network contracts. Generally speaking, mobile broadband service will not function without having an Internet data subscription in place from some provider.
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