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D
DTMF tones See Dual Tone Multi-Frequency tones.
default A feature's original setting as pre-programmed in the factory.
Dual Tone Multi-Frequency tones The tones that your telephone
transmits when you press a key on the keypad. These tones are used to
access automated calling systems such as Voice Mail, paging services,
banking-by-phone, etc. These tones are also heard by the party on the
other line if you use the Scratchpad while a call is in progress.
Synonymous with Scratchpad tones or touch tones.
E
emergency call This feature allows you to make an emergency call
even if your phone is locked, by dialing 911 or another emergency
access number.
F
fringe area The outermost range of a cellular system where signals are
weak.
function keys The non-numeric keys on your phone's keypad used to
perform specific tasks.
H
home system The local cellular system where you obtain your cellular
service.
home type system A cellular system of the same type as your local
cellular system. See also non-home type system, and system type.
I
icon One of the variety of symbols used to designate menu features
and messages.
indicator A light on your phone that gives you information about your
phone's status.
Internal Charger A charger built into your phone for use with an AC
adapter or vehicle power adapter. See "Using the Internal Charger" on
page 20.
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