According to the BBC " most of the evidence is circumstantial and anecdotal. There is no absolute proof mobile phones are hazardous." [2] Some airlines do allow use of mobiles phones in flight, only restricting their use (and use of all other electronic devices) during take off and landing when communications with the ground are most critical. Meanwhile the passenger aircraft manufacturers, such as Boeing and Airbus, have begun to introduce wireless services on their planes (e.g. WLAN) and radio-based satellite phones are a standard installation on aeroplanes. Clearly there is a direct airline industry advantage in having control over communication systems from within an aeroplane with no clear way for potential competitors to certify their systems as safe for use on board. Some articles have even gone so far as to accuse the airline industry of pushing the ban on mobile phones in order to increase revenue from on-board telephones [3]. A number of new phones have an "airplane mode" feature that presumably stops all incoming and outgoing communications while still allowing the user to play games, type notes etc.
A few U.S. airlines have announced plans ([4] and [5]) to allow mobile phones to be used on aircraft, pending approval by the FCC and the FAA. The idea is similar to that used in some cars on the German ICE train: the aircraft will contain a mobile signal repeater that will then transmit the signals to a terrestrial-based system on separate frequencies that do not interfere with the cellular system. Since the repeater is literally right next to the passengers, the phones' output power would be reduced to the lowest level possible, reducing interference with cells on the ground. ARINC and Telenor have formed a joint venture [6] company to offer such a service on-board commercial aircraft and will be launching a service in late 2006 that will safely allow you to use your cellphone on-board the aircraft. The cellphone calls are routed via the on-board SATCOM to the ground network and an on-board EMI screening system stops the cellphones contacting the ground network.