Want to be able to hear that a particular person is calling you? You can set a ringtone specifically for that person.
Select Menu > Contacts.
Set a ringtone for a contact
Select a contact and Options > Edit.
Select the Ringtone field and a ringtone.
Set a ringtone for a contact group
Open the Groups tab.
Select and hold the title of a group, and from the pop-up menu, select Ringtone.
Select a ringtone from the list.
The ringtone only applies to the members of the group at the time that the ringtone is set.