8. Touch Tones
Your phone is a “Touch Tone” phone, meaning that it creates
certain sounds when you press the keys. These sounds
can be used for many automated, over-the-phone services
such as checking your bank balance, using your voice
mailbox options, and even checking airplane arrival and
departure times.
Touch Tones are called “DTMF” (Dual Tone Multifrequency)
tones in the phone.