O2 and its mobile network equipment supplier Ericsson have issued a joint apology to the millions of customers hit by disruption to its data services.
O2 chief executive Mark Evans said the firm would work with Ericsson through the night to resolve the problems.
Mr Evans said Ericsson had given assurances that a full service would be restored by Friday morning.
https://www.bbc.co.uk/news/business-46464730