Plain old telephone system
Public Switched Telephone Network
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[pleyn] /pleɪn/ adjective, plainer, plainest. 1. clear or distinct to the eye or ear: a plain trail to the river; to stand in plain view. 2. clear to the mind; evident, manifest, or obvious: to make one’s meaning plain. 3. conveying the meaning clearly and simply; easily understood: plain talk. 4. downright; sheer; utter; self-evident: […]
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