Heard lots about this but have not seen any conclusive proof that mobile phones affect computer systems. I once took a mobile phone call whilst in a petrol forecourt to the horror of another driver filling up her car. She protested so I walked 3 metres to the outside of the gargae perimeter. No problem then. Although we are not allowed to use mobiles on the flight deck in flight they are used on the ground. If mobiles affect computers then why are they used in the vicinity of any computers. Does anyone have any hard evidence to justify the non use of mobile phones on aircraft or which may affect computers.