Sony CLIE PEG-NR70V/U, PEG-NR70/U Operating Instructions Manual page 56

Managing addresses and phone numbers (Address Book)
Viewing addresses by category
Press the Jog Dial navigator when the address list is displayed but
none of the listed entries are selected.
Each time you press the Jog Dial navigator, the display toggles through all
the available categories.
To select a category from the categories list
Tap the arrow V at the upper right corner of the screen to display the
category list. You can select the desired category from the list.
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Chapter2
Using Basic applications