TOYOTA 2012 Tacoma - Manual (Page 331)

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3-4. Using the hands-free phone system (for cellular phone)
Select the name to be registered by either of the following
methods, and select “Confirm” by using a voice command or
:
a. Press the talk switch and say the desired name.
b. Select “Record Name” by using , and say the desired
name.
Select “Confirm” by using a voice command or .
In , selecting “Set Speed Dial (Speed Dial)” instead of
“Confirm” registers the newly added phone number as a speed dial.