Toyota 2008 Prius Quick Reference Manual page 318

3-4. Using the hands-free system
n Transferring calls
It is not possible to transfer from hands-free to the mobile phone while
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driving.
If you transfer from the mobile phone to hands-free, the hands-free
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screen will be displayed, and you can operate the system using the
screen.
Transfer method and operation may vary according to the mobile phone
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used.
For operation of the mobile phone in use, see the phone's manual.
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To send a tone by speed tone
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Touch
speed tone list displayed.
While driving
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Key input is unavailable.
290
PRIUS_U_(L/O_0802)
then touch . Choose the desired number from the