That is simply an option in the settings you can turn on or off.
I'm new to the site and new to HTC. I had a Droid X prior to this. Had my Rezound for a week and I LOVE it. Still getting used to the differences, but 4GLTE is crazy fast in Sacramento, CA. Good reception everywhere. I can't figure out how to stop the vibration when calls come in... The extended battery is AWESOME!