MCI AND SPRINT ON LINE TO BEGIN TOLL-FREE 800 SERVICE

American Telephone & Telegraph Co.’s two largest long-distance competitors are about to enter the $4-billion-a-year market of providing toll-free “800” telephone numbers. The toll-free number, which allows potential customers to make free long- distance calls to businesses to place orders or request information, has been one of the fastest-growing marketing tools for businesses in recent years. Companies with the 800 numbers pay the costs for

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