Here's what we know about the outage hitting 4G and data services.
Is the O2 network down?
It appears that the network issues started about 5.30am, and customers across Manchester, London and Southampton have all reported outages.
The network confirmed they were investigating.
"We apologise for any inconvenience."
Are Giffgaff, Sky, and Tesco Mobile services affected too?
The issues also seem to have affected customers with Giffgaff and Tesco Mobile, which both share O2's network.
The Sun has contacted both Giffgaff and Tesco for a comment but haven't yet heard back.
Sky tweeted: "Sky Mobile customers may not be able to use your data services this morning.
"Voice calls and SMS are unaffected.
"Technical teams are working on the problem. Further updates to follow."
When will 4G data connections be back online?
In a statement on social media, commenting: "We are aware our customers are unable to use data this morning.
"Our technical teams are working on the issue with high priority.
"We are really sorry and working as hard and as fast as we can to fix this.
"Please keep an eye on our status checker: o2.uk/ServiceStatus."
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