UK's telecom regulator Ofcom has released the outcome of the principal stage of its 4G, 5G spectrum auction. EE, Telefónica, Vodafone came out as big winners. Ofcom has been running an auction of spectrum in two frequency bands: 2.3 GHz, which is usable by current 4G mobile and 3.4 GHz, which is one of the spectrum bands earmarked for 5G.