[Samsung Blackjack II with WinMobile 6.1]

When some calls, instead of ringing, the phone "announces" the call, either
by text-to-speech reading Contact list name associated with number calling,
or saying the number calling if not in Contacts list. The voice is faint.

I have usually have phone set either to Normal or Outdoors profiles, with
ring volume at 4 (Normal) and Loud (Outdoors).
The ring tone chosen is "4.unfolding", which is a little tune of bell-like
sounds.

QUESTION: HOW CAN I SWITCH OVER TO JUST THE RING TONE?

Thanks