A1[C or U](formaltelephone)a device that uses either a system of wires, along which electrical signals are sent, or a system of radio signals to make it possible for you to speak to someone in another place who has a similar device: Just then, his phone rang.Could you answer the phone?We speak on the/by phone about twice a week.You had three phone calls this morning.If the phone lines are busy, please try again later.Could you pick the phone up for me - my hands are wet.I left the phone off the hook, so it wouldn't ring.I was so angry I just put/slammed the phone down (on her) (= replaced it before our conversation was finished).Telephone equipmentbe on the phone›to be using the phone: That son of mine is on the phone all day!Communicating by telephone›UKto have a landline(= fixed phone) in the home: Are the Middletons on the phone, do you know?Communicating by telephone