Here's the link to the FAA Safety website. You can send an email with the following info:
Contact the Aviation Safety Hotline
Date incident occured: May 30, 2008
Pilot in question: Captain Jeffery Bruce Osborne B737 DFW
Occurence: violation of FAR 121.542 Unneccessary use of cellphone during critical phase of flight while on an active runway 18L DFW Airport.