AT&T is scheduled to release earnings Wednesday. Stock for the communications and entertainment services giant is trading near a multi-year high, but still below its record high set in 1999. After stumbling in its first full month of DIRECTV service last month, AT&T has managed to sign up more than 200,000 paying subscribers. The question is, can it make a dent in offsetting its continued loss of U.S. mobile phone customers to T-Mobile, Sprint and other rivals?

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