QuoteWalk into any supermarket in the U.S. and it's easy to see that Americans have more choices in terms of products they can buy than most people in the world. But when it comes to choosing a cell phone, consumers in the U.S. are limited to a handful of devices offered by a few manufacturers, and those devices are sold solely through a single service provider. This means that Verizon Wireless subscribers are limited to phones sold specifically for the Verizon network. And Cingular Wireless subscribers are limited to handsets that Cingular sells. It also means that when subscribers switch from one service provider to another, they are unable to take their phones with them.