See also:

Playing MP3 and WMA discs
Loading and ejecting MP3 and WMA discs Selecting MP3 and WMA discs ...

Overview buttons and guidance screen
...

Locking or unlocking the phone book
Select “Phonebook Lock (Phbk Lock)” or “Phonebook Unlock (Phbk Unlock)” using a voice command or the “TUNE/SEL” knob. Input the PIN by either of the following methods and select “ ...