Toyota 2012 Prius C Owner's Manual page 337

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Phone number
Up to 1000 names can be stored.
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Call history
Up to 10 numbers can be stored in each of the outgoing, incoming and
missed call history memories.
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Limitation of number of digits
A phone number that exceeds 24 digits cannot be registered.
3-3. Using the Bluetooth
®
audio system
3
317