O2 network down as thousands of customers lose access to 4G data

Ericsson apologises for telco service failures identifies expired software certificate as main issue

"We are aware our customers are unable to use data this morning", the company said on its official Twitter account.

Users across the country said they were unable to access the internet without a wi-fi connection.

Some users are still reporting issues with voice calls.

In a further tweet, O2 said the problem was related to a software issue in the system of a third party supplier.

O2 said its technical teams are working with its supplier's teams to fix the problem.

The Financial Times said the O2 outage was related to an issue with software provided by Ericsson. "We'd encourage our customers to use wifi wherever they can and we apologise for the inconvenience caused".

Those on Sky, Tesco, Lyca Mobile and Giffgaff are also affected by the technical glitch. The company estimated 32.1 million people use its mobile network in the UK.

O2 customers are facing problems accessing their data and other services this morning. Transport for London said: "The company that updates the data to our network of Countdown Systems is now experiencing difficulties in providing this service".

The company, the second-largest mobile network in the United Kingdom, said it was investigating the technical fault.

O2 says it is trying to resolve the issue as fast as possible. "This issue is being investigated".

Other services which rely on O2's network, such as Transport for London's live bus electronic timetable - and all the apps that make calls to the API - are also down.

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