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There were also been several thousand reports from users of Smarty and ID Mobile – smaller mobile companies which use Three’s network.
Storm Éowyn has also caused problems for Three on Friday.
A spokesperson from Three said: “Following an issue affecting voice calls yesterday, our services are now fully back to normal, apart from some localised issues related to Storm Éowyn. We are very sorry for any inconvenience it caused to our customers.”
The spokesperson said extra engineering resources had been deployed to deal with any disruption caused by the storm, which is battering the UK on Friday.
Just after 08:00 on Friday, Downdetector had over 1,300 reports of outages on Three but it has diminished since then. Three also told the BBC a “very small number” of customers who are connected to WiFi when calling are not getting through on Friday.
Three has around 10.5m customers across the UK, according to its website, but it is unclear how many of them were affected by the outage.
Many people on social media shared their frustration and described the disruption they said it had caused them.
One person claimed, external they had “missed a medical appointment” as a result of being unable to receive calls, while another said, external the issues had left their daughter “stranded”.
And several people have claimed, external they would be leaving the network altogether.
In a statement on Thursday, the regulator Ofcom said it was in contact with the network to “establish the scale and cause of the problem as soon as possible”.
It is not known whether customers will be able to claim compensation for the outage, although according to the Ofcom website it “may be appropriate” for providers to offer refunds “while repairs are being made”.
It comes a month after the UK regulator gave the go-ahead for Three to merge with former rival Vodafone in a £16.5bn deal.
Meanwhile, the Three outage occured on the same day a major outage affected artificial intelligence tool ChatGPT.
