Motorola ROKR E1 User Manual page 62

features
set category for entry
M > Address Book > entryM > Edit > Category
> category name
Note: The Category option isn't available for
entries stored on the SIM card.
set category view
M > Address Book
M > Categories > category view
You can display All entries, entries in a
predefined category (Business, Personal, General,
VIPs), or entries in a category you create.
60 other features—address book
features
set category ringer ID
Set a distinctive ring alert (ringer ID) to
sound when you receive calls from entries
in a specific category:
Press M > Address Book,
press M > Categories, highlight the category,
press M > Edit > Ringer ID
Note: The Category option isn't available for
entries stored on the SIM card.
To activate ringer IDs:
M > Settings > Audio > style Detail > Ringer IDs