Here's a quick and dirty solution:
Remove the battery cover of your device. See the camera lense? The flash is above it. Look to the left of those two... see that small plastic grid? That is the speaker. (Location may differ from device to device, I'm using an 8100) anyway, cover that area with your thumb (not too rough, it's just thin plastic) and play an mp3. Notice the difference in volume? Cut a small piece of electrical tape to the shape of that grid, leaving a little room in all directions to allow the tape to stick to the area around the speaker. Leave a very small area UNCOVERED, and be careful not to obstruct your camera lens/flash! Now that the tape is in place, replace your battery cover and play another mp3 or call your phone. Too loud? Cover more speaker. Too quiet? (Picky aren't we?) Cover less speaker. It's all about trial and error so don't give up too quickly.
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