Crossword clues for Telephone abbr. 4 letters:OPER0, on a telephone: Abbr.OPERTelephonic abbr.EXTSTelephones: Abbr.OPERTelephone abbr.SWBDTelephone panel: Abbr.SECYTelephone answerer: Abbr.OPERTelephone dial abbr.OPERTelephone button abbr.OPERTelephone keypad abbr.MSGSWhat blinks on a telephone may signify: Abbr.EVESAbbr. after some telephone numbersOPERAbbr. on a telephoneEXTType of telephone: Abbr.EXTAdded telephone line (abbr.)EXTTelephone line: Abbr.RESTelephone book abbr.EXTAbbr. after a telephone no.EXTAbbr. after a telephone numberNOSTelephone book info: Abbr.RESAbbr. after a telephone no.ELOTelephone Line band (Abbr.)RESAbbr. next to a telephone numberTTYTelephone device used less widely since the invention of smartphones (Abbr.)