Wirelessly posted (BlackBerry 8700g: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
The icon image (speaker) is set to open Profiles by default and is used my pushing the left side key.
You can change the side key to open up a different app but the speaker icon will stay no matter what app you set the side key to open.
To change the function of the left side key or the center key go to Options -- Screen / Keyboard.
I hope this helps