The benefits of using a smartphone in aviation.
-Naips access for flight plan/Sartime submission and/or amendment
-Naips weather... updatable in flight
-Bom radar
-Ability to contact and receive info from responsible person WRT
Actual destination weather/strip conditions/facilities/LAME/Refueller/
manually get runwaylights turned on/ etc etc
-emergency backup GPS/Altimeter/Airspeed Ind/VSI and soon AH
-emergency torch
-emergency contact with ATC
-forced landing Sar comms/Gps location
-Sar time cancellation reminder and cancellation
-flight plan creation assistance
IMHO, a responsibly used mobile phone enhances safety of flight far more than any detractions.
The idiot who blasts along listening to music or farking about with his phone and ignoring the radio environment, would probably be reading a magazine or having a snooze if he didn't have a phone.