i was trying to figure out the same thing and actually got the answer from my blackberry curve w. the help option. you have to move it to the ringtone folder. so, if the pearl is anything like the curve, go to your media and hover voice notes. press the menu button and select "explore". press media card, blackberry, then voicenotes. go to the voicenote you want, press the menu button and select "move". go to the little folder that says "up" and click that. then go to the folder that says ringtones and click the menu button and click "move into". when you go to your profiles to select your sms tone, it will be at the top. hope this helps.