Thousands have taken to social media to vent their frustrations, with services across the country ranging from Transport for London's electronic bus stop timetables to mobile card readers relying on the network. Our technical teams are working extremely hard to resolve this.
O2 customers are now experiencing difficulties after the mobile network went down. Voice calls are working OK. "We apologise for any inconvenience".
The outage also has serious implications for places that rely upon the O2 network for real-time informational services, as reported by the Independent.
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. Transport for London said: "The company that updates the data to our network of Countdown Systems is now experiencing difficulties in providing this service".
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In statement released by the company this morning O2 say: "One of our third party suppliers has identified a global software issue in their system which has impacted us. This issue is being investigated".
But now message from O2 is I've no internet connection.
It's encouraging users to "use Wi-Fi wherever they can".
It is not clear when the issue will be resolved, but O2 said it would share further updates as soon as possible.