Blackberry says services 'fully restored'

In a press conference at 15:00 BST, Lazaridis said the company would now begin a full investigation of what happened.He apologised again for the problems customers had experienced."We know we've let many of you down. You expect more from us. I expect more from us," he said.

The firm admitted that it was the largest crash it had ever experienced. Prior to the 2011 problems, the last significant blackout was in 2009.The next priority would be a "root cause analysis" of why there was a core switch failure within RIM's infrastructure.