O2 disruption: Why did the network fail?

Help

The network problems that hit tens of thousands of O2 customers have continued into a second day.

The mobile firm said its 2G network had now been restored and that customers should now be able to make and receive calls.

Technology Correspondent Rory Cellan-Jones explained why the O2 mobile network suffered disruption.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.