In regards to pilots and mobile phone use, believe me it occurs more than you think in both GA and airlines
Questions arose re a Chieftain crash at Christchurch about cellphones. For the last three minutes of the ILS approach the pilots phone was active. The crash terminated the call. Eight died, two survived with serious injuries.
http://www.taic.org.nz/AviationReports/tabid/78/ctl/Detail/mid/482/InvNumber/2003-004/Page/4/Default.aspx?SkinSrc=[G]skins%2ftaicAviation%2fskin_aviation