Toyota Urban Cruiser Owner's Manual page 313

 Call history
Up to 5 numbers can be stored in each of the outgoing and incoming history
memories.
 When talking on the phone
 Do not talk simultaneously with the other party.
 Keep the volume of the receiving voice down. Otherwise, voice echo will
increase.
URBAN CRUISER_OM_OM52C63E_(EE)
3-3. Using the hands-free system (for cellular phone)
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