O2’s internet service is down, leaving customers of the network unable to get online.

The problems mean those companies that share its network – such as GiffGaff and Tesco Mobile – are also being hit by the problems.

Calls can still be made by customers despite the fact 4G data connections are broken, O2 said, though some users reported having so signal at all.

Affected phones, which may be every single device registered to the network, simply fail to show any kind of data connection and will not connect even when turned off and back on or when other workarounds are tried, according to users experiencing the problems.

Some users also suggested SMS messaging was not working, leaving them unable to send texts.

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“Our technical teams are investigating reports of issues when using data,” O2 wrote on its status page. ”Voice calls are working OK. Our technical teams are investigating. We apologise for any inconvenience. Updates will be shared here as soon they are available.”

That page itself appeared to be having issues, often failing to load.

A tool on the same page that allows users to check if the outage is happening in their area did not appear to be working, bringing up an error message saying that the system was having “technical problems” but that “engineers have been notified”.

The problems were happening across the UK, according to the website Down Detector.