O2’s chief executive Ronan Dunne welcomed the prospect of early 4G roll-out but said it was “deeply frustrating” that it had taken this long to work out that the 4G spectrum could be freed up earlier. He also made it clear that mobile operators have a lot of work to do to educate the public about its benefits. “A huge proportion of our customers think they have got 4G already because they have a phone that says iPhone 4,” he said.