Sprint Nextel 755P - Manual (Page 50)

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8. Select ringtones from the following pick lists:
Ⅲ Known Caller for an incoming call from someone in your Contacts or Favorites.
Ⅲ
Unknown Caller for an incoming call from someone identified by caller ID who is
not in your Contacts or Favorites.
Ⅲ
Roaming for incoming calls when you’re outside the Sprint National Network.
9. Select Done.