TOYOTA 2011 Tundra - Manual (Page 454)

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3-5. Using the hands-free phone system (for cellular phone)
The following operations can be performed:
Dialing: Press the off-hook switch or select “Dial” by using a voice
command or .
Storing the number in the phone book: Select “Store” by using a
voice command or .
Deleting: Select “Delete” by using a voice command or .
n Call history
Up to 5 numbers can be stored in each of the outgoing and incoming call his-
tory memories.
n When talking on the phone
l Do not talk simultaneously with the other party.
l Keep the volume of the received voice down. Otherwise, voice echo will
increase.