TOYOTA 2010 Prius - Manual (Page 356)

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3-3. Using the hands-free system (for cellular phone)
Operating the system by using a voice command
By following voice guidance instructions output from the speaker,
voice commands can be given to allow for operation of the hands-
free system without checking the display or operating .
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Operation procedure when using a voice command
Press and say a command for a desired function.
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Auxiliary commands when using a voice command
The following auxiliary commands can be used:
Cancel: Exits the hands-free system
Repeat: Repeats the previous voice guidance instruction
Go back: Returns to the previous procedure
Help: Reads aloud the function summary if a help comment is
registered for the selected function
Using the hands-free system for the first time
Before using the hands-free system, it is necessary to register a cel-
lular phone in the system. The phone registration mode will be
entered automatically when starting the system with no cellular
phone registered. Follow the procedure below to register a cellular
phone: