That being said, I would probably start by using the equalizer to eliminate the high end anything you picked up on the phone over 5 kHz is probably noise. I often use Audacity at the beginning and ending of a project, but I add all my cool effects using other programs. The biggest drawback in Audacity is that you can't adjust effects while you are in playback mode you have to apply an effect over a time range, and then listen to your clip to evaluate the results.
