Answer: dialtones

AnswerCrossword Clue
DIALTONESCells don't have them
DIALTONESPhone sounds
DIALTONESSignals from cells?
DIALTONESAvailability indicators
DIALTONESLand line signals
DIALTONESCall preceders
DIALTONESCell phones' lack
DIALTONESSurfing needs, perhaps
DIALTONESFamiliar sounds.
DIALTONESTelephone sounds.
DIALTONESConnection indicators
DIALTONESPhone go-aheads