Maybe mobile phones aren't such a bad business after all. Having bailed out of the crowded, pricey wireless sector in 2001, both BT and AT&T; last week made it clear they want back in. Britain's largest residential telecom announced a deal with longtime rival Vodafone to offer the world's first fully converged handset that acts both as a mobile and as a fixed-line phone. BT's U.S. counterpart, AT&T;, similarly announced an agreement with a big rival to offer AT&T-branded; mobile services via the Sprint network. Why the rush back to wireless? That's where the growth...
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