Virgin Mobile has apologised as it seeks to repair a technical glitch that has affected thousands of customers.
The operator is understood to have first experienced some disruption early on Tuesday morning – with service outages later spreading across large parts of the UK.
The tracking website – Is The Service Down – reported complaints first appeared on social media at 8:20 am, peaking as the afternoon wore on.
A spokesperson said: “We’re working quickly to resolve an issue that’s affecting some of our customers making calls, sending text messages and using mobile data.
“We apologise to our customers for the inconvenience caused.”
Virgin Media said the problems only affected its mobile phone services, which use EE-owned infrastructure, and there was no issue with its cable services.
The company was yet to say what it believed had caused the outage.
Twitter users complained they had been left in the dark about the disruption though Virgin said its team had been responding directly to complaints and had posted a statement on its website.
There was a familiar theme to the complaints – with the majority stating they had been unable to use their devices for hours.
One wrote: “@Virginmedia any news??? Ive been offline since 11am… no calls, No texts, nothing. I am trying to earn a living and book in work for the week, but looks like ill have to miss out!! Thanks a bunch, who do i invoice for loss of earnings???”.