How do I disable the "Touch to unlock" message on my LG Xenon while on a call?

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This has been bothering a lot of LG Xenon owners. While on a call the screen locks and the "Touch to Unlock" message flashes. Although you can change the time it takes for the screen to lock in settings (15 seconds, 30, 1 minute, off), this does not apply while you are on the phone. Apparently this is a default setting that can't be changed and is there so you don't accidentally hit buttons with your face while talking.