Allows users tracking the condition of the other telephone or the subscriber, for example, there will appear a signal on the screen of the telephone device informing that the subscriber is on the line and is temporarily unavailable.
MCI International Inc.
MCI is the United States` second largest long distance company for residential customers. In April 2002, MCI launched The Neighborhood built by MCI, the industry`s first truly any-distance, all-inclusive offering combining local and nationwide long distan
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