palmOne Treo 600 Using Manual page 120

If you prefer to use the
onscreen Dial Pad, assign
the Dial Pad as the default
wallpaper.
If you remove the Dial Pad
as the wallpaper, you can
still access it quickly. Press
Phone, then press Center.
118 :: Phone settings
Assigning a caller ID picture and ringtone
1. Press Phone .
2. Press Up to access your Favorites buttons.
3. Highlight the Favorites button you want to give a picture caller ID.
4. Press Menu .
5. From the Edit menu, choose Edit Favorites Button (/E).
6. Choose More.
7. Check the Image box, then choose Select Image.
8. Choose the picture you want to assign to the selected Favorites button.
9. Choose Select.
10.Choose the ringtone pick list, then select a caller ID ringtone.
11.Choose OK.