Bruno Senna (nephew of Ayrton Senna) has released a video of himself driving one-handed around Circuit de Spa-Francorchamps race track (home to the Formula One Belgian Grand Prix) whilst using his other hand to hold a mobile phone, which recorded this video.
We do have to ask, why he couldn't invest in a mount for a real camera? He says "Video made with my phone camera during the demo at Spa! Please note I drove within safe limits and not flat-out. Don't use your phone and drive!!". Senna is currently the test driver for the Renault GP Formula 1 team.