Nokia 5180 - Manual (Page 47)

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Automatic answer
This feature is available only when your phone is connected
to a headset or to an approved handsfree car kit equipped
with the ignition sense option, with the ignition on.
When automatic answer is turned on, your phone answers
incoming voice calls after one ring. Use Menu 4 1 4 to turn
this feature on or off.
Touch tones
Your phone can generate various sounds, called touch tones,
when the keys are pressed.
Touch tones can be used for many automated services such
as checking voice mail, movie times, and airline arrival/
departure times.
Note: Sending confidential information over the air using
touch tones is not recommended.
Setting manual touch tone length
Use Menu 4 2 1 1 to set the length of touch tones created
when you press a key:
Continuous sounds the tone for as long as you press and
hold the key.
Fixed sets the tone length to one tenth of a second,
regardless of how long you press and hold the key.
Off turns off touch tones. No tones are sent when you press
the keys.
Setting automatic touch tone length
Use Menu 4 2 1 2 to set the length of touch tones sent
automatically by the phone to Short (one tenth of a second)
or Long (half a second).