Okay, I've noticed that when I receive a text, I get a little ding or notification. I don't mind that. What I do mind is the high-pitched cricket noise I get when I get a new Yahoo! Messenger message. Is there a way to change this tone? If so, how?
Go to Profiles Icon>Advanced>Normal(Active). Once here go to Yahoo! Messenger. You will see a list. Go to "Ring Tone" should be second from the top. You should have default tones that came with your phone and can pick from those.... I hope this helps...
Changing message tone for Yahoo! 
Linear Mode
