Toyota Prius 2011 Manual page 353

Using the call history memory
Follow the procedure below to use a number stored in the call history
memory:
STEP 1
Press
the outgoing call history memory) or "Call back" (when using a
number stored in the incoming call history memory).
STEP 2
Select the number by either of the following methods:
a. Say "Previous" or "Go back" until the desired number is
displayed.
b. Select the desired number by using
3-3. Using the hands-free system (for cellular phone)
and say "Redial" (when using a number stored in
.
353
3