The term 'phone button' refers to the various buttons found on a telephone. The crossword solutions for this term are HOLD (4 letters), OPER (4 letters), ASTERISK (8 letters), REDIAL (6 letters), STAR (4 letters), REDI (4 letters), and DEF (3 letters). HOLD is a button that allows the user to put a call on HOLD, OPER is a button that connects the user to an operator, ASTERISK is a symbol used to indicate multiplication or repetition, REDIAL is a button that allows the user to redial the last number dialed, STAR is a symbol used to indicate a comment or request, REDI is a button that allows the user to redial the last incoming call, and DEF is a button that allows the user to access the phone's default settings.