Subaru 2009 Impreza Navigation System - Manual (Page 219)

Handsfree 219
Other Bluetooth settings
5
Select a name on a Phone Book whom you want to add
to the Speed Dial memory.
6
Select a phone number which you want to add to the
Speed Dial memory.
7
Select a registering position where you want to add to
the Speed Dial memory.
8
If you are going to overwrite the Speed Dial memory,
select
(Yes) to finish the adding.