W755 side voice dial button

Can anyone tell me if its possible to completely disable the voice dial button on the side of the phone?

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Menu
Settings and Tools (Far right icon)
Tools (#2 on the list)
Voice Commands (#1 on the list)
Hit settings, which is going to be the right bumper button (above the CLR key)
Go to prompts (#5 on the list)
Mode (#1 on the list)
It will be currently set on prompts, which is why it says "Please say a command." You can either set it to readout or tones only. Tones produces a short beep. Readouts only displays text (no noises). Being that you have your phone on silent, I assume you want readouts.