News roundup: AT to buy Alltel operations for $780M … Poll shows investor optimism about stocks hits 3.5-year high … Apple rumored to release three new iPhones in 2013

    Insider
    Dialed in: AT&T announced this morning that it has reached a deal to buy the Alltel U.S. wireless operations for about $780 million to boost its spectrum in rural areas. The Dallas-based telecommunica…

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