Touch tones
Touch tones, or DTMF tones, are the tones that sound when you press the keys on your
phone’s keypad. You can use touch tones for many automated dial-up services such as
banking and airlines, or for entering your voice mailbox number and password.
Touch tones are sent during an active call. You can send them manually from your
phone’s keypad, or send them automatically by saving them in your phone.