Any Key Answers?

[Groucho]

I have searched and searched and cannot find an answer. Is there anyway to disable the volume up/own key so it does not answer an incoming call when the phone is locked? If a call comes in while the phone is alseep and locked it answers if I accidentally touch the up/down volume button whiole rummaging through my pocket for the phone. Another Dinc owner told me there is an "any key answers" setting that I must have checked. If there is such a setting I cannot find it. Help?