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4G wireless technology: A look at what’s ahead

Bob asked: As Sprint rolls out its 4G network and Verizon and AT&T plan their own, The Times asks analyst Charles Golvin what cellphone users should expect   (Sony Vaio VGN-FZ battery)   .The first cellphone in the U.S. to use fourth-generation wireless technology — better known as 4G — debuted this month with the promise [...]