Caller's need (5)
(Other definitions for phone that I've seen before include "Receiver" , "Covert monitoring of electronic exchanges" , "Ring (someone)" , "Short piece of electronic equipment" , "Communication device" .)
(Other definitions for telephone that I've seen before include "Call, ring" , "Transmitter of speech, and now text and pictures" , "It transmits speech at a distance" , "Communication device" , "Transmitter of spoken words" .)