Toyota 2006 Prius Owner's Manual page 208

D
Editing the phone number
You can register a phone number in
"TEL1" and "TEL 2" separately. Up to
2 numbers a person can be registered.
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1. Touch the "TEL 1" or
switch.
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2. Input the number and touch "OK".
"TEL 2"
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3. Select the desired icon.