O2 said its technical teams are working with its supplier's teams to fix the problem.
(DPA/PA Images/Getty)Why is O2 not working?
A data network outage that has left O2 customers unable to use mobile data is the result of a "global software issue" according to the operator. These include subsidiary Giff Gaff, and third-party networks, notably GiffGaff, Tesco Mobile, Sky Mobile and Lycamobile.
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Thousands of customers are believed to have been affected in the data blackout, which is also affecting customers of other mobile providers who use O2's service.
The Transport for London's electronic timetable service at bus stops relies on the O2 network, so this service is also down. Transport for London said: "The company that updates the data to our network of Countdown Systems is now experiencing difficulties in providing this service".
When these networks are taken into account, up to 32 million customers are affected. "Our technical teams are working extremely hard to resolve this", the company said.
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