It's amazing what today's cell phones can do on a digital network. Their latest trick: accessing the Web to check the weather, look up a stock price or find out if the Rangers won. They can also read e-mail, send a short text message, keep a calendar and respond to voice commands. But the one thing they can't do is offer reliable service. Is it any wonder that a majority of mobile phone users have stuck with old-style, no-frills analog service? Analog is more expensive, but it's everywhere, while digital networks still suffer from spotty coverage, even in big markets like...
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