Individual callsigns - 2O, GO, MO To celebrate the Olympic Games and Paralympic Games that were held in London in 2012, UK radio amateurs could apply to use a special temporary callsign during the period 00:00 2012-07-21 to 23:59 2012-09-09. Dates are British Summer Time (GMT+1) Callsign format The normal prefix of an individual callsign was replaced as follows: 2D, 2E, 2G, 2I, 2J, 2M, 2U, 2W prefix callsigns all used 2O prefixes. G, GD, GI, GJ, GM, GU, GW prefix callsigns all used GO prefixes. M, MD, MI, MJ, MM, MU, MW prefix callsigns all used MO prefixes. The digit and suffix of all SES callsigns were the same as the licensee's normal callsign. Flagship stations with prefix 2O12 Two flagship stations were QRV as follows: These were: 2O12L - London, England 2O12U - Various UK locations, info awaited 2O12W - Barry, Wales Special Event stations with prefix GB2012 Callsigns in the series GB2012aaa were available for Special Event Stations relating to ...