uSwitch mobile phone expert Ernest Doku has advised users how to cope without data, saying: "O2 users affected by this mobile data outage will understandably be concerned and frustrated".
O2 issued the following statement on its website: "Our technical teams are investigating reports of issues when using data".
Ericsson, whose central user database caused O2's 2012 25-hour mega-outage, told The Reg: "We are aware of the issue and are working together with our customers to solve it as soon as possible". Our technical teams are working extremely hard to resolve this. Voice calls are working OK.
In total, around 32 million customers are affected.
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GiffGaff has confirmed its service is also offline.
The most recent update of their progress was provided on the O2 UK Twitter account just after 12pm, it said that they are working closely with the 3rd party suppliers to try and fix the problem.
Customers of O2, GiffGaff and virtual operators who use Telefonica's network in the United Kingdom have been hit by a spectacular outage across the country. They're now working hard to resolve the issue so we would imagine it won't be too long before its back up. Londoners, for example, are finding that the Countdown timers at bus stops are all crippled as they can't communicate with London's transport executive, TfL.