O2 UK CEO: 'I'm very sorry'

The chief executive of O2 UK, Ronan Dunne has tweeted:

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To all our affected customers - I'm very sorry. The network is back. My focus now is restoring your confidence and trust in O2.

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'Seven million' O2 users affected

Around a third of O2 customers, about seven million people, were "potentially impacted" by its network outage, the mobile service provider has said. The networks have been restored after users were unable to send or receive calls or texts.