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Meanings of plain old telephone system in English

Voice-grade analog telephone service; the basic form of residential and small business service connection to the telephone network now gradually replaced by more advanced forms of telephony such as ISDN, mobile phones and VoIP.

pots
post office telephone service
post office telephone system
plain old telephone service

Usage of plain old telephone system in English

We brightened up a little when he explained that they were the " Plain Old Telephone System" and the "Pretty Advanced New System". 
 The Irish Times 

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Meanings of plain old telephone system in English