LG CG300

I recently purchased this phone, and like it alot, except for the push to talk button on the left hand side of the phone. It is in the exact spot that you place your hand to pick up the phone, thus it gets pressed a lot. Unfortunatly, i have no desire to use this feature, and do not want to get charged for pressing the button.

Does anyone know of a way to lock the PTT button?

Thanks