On 18 October 2007 the Office of Communications published proposals[29] for the technical and authorisational approach that would be adopted to allow this for European GSM users on the 1800 MHz band on UK registered aircraft.[30] and on 26 March 2008 Ofcom approved the use of mobile phone-supporting picocells aboard aircraft in the United Kingdom. Airline companies will have to first equip the aircraft with picocells and apply for licences.[31][32]