Toyota Prius 2007 Owner's Manual page 190

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You can do this operation when you want
to operate an answering machine or use a
telephone service in bank for example.
You can register the phone number and
the code number in the phone book.
190
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Sending a tone by the speed tone
You can send a tone by the speed tone.
(For registering the speed tone, see
"Registering the speed tone" on page
195.)
1. Touch the "Speed Tone" switch.
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2. Touch the desired switch to send a
tone.