Toyota 2011 Prius Owner's Manual page 376

3-3. Using the hands-free system (for cellular phone)
Transferring a call
A call can be transferred between the cellular phone and system
while dialing, receiving a call, or during a call. Use one of the follow-
ing methods:
a. Operate the cellular phone.
Refer to the manual that comes with the cellular phone for the oper-
ation of the phone.
b. Press
c. Press
1
*
: This operation can be performed only when transferring a call
from the cellular phone to the system during a call.
2
*
: While the vehicle is in motion, a call cannot be transferred from
the system to the cellular phone.
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PRIUS_U (OM47685U) DVD
1
*
.
and say "Call Transfer"
2
*
.