EE is working to fix an issue with its internet service that is affecting “some” customers, it said.
The Down Detector website said there had been more than 200 reports of problems since shortly before 8am on Tuesday, with the majority of issues around connecting to mobile internet.
An EE spokesman said: “We’re aware of a data issue affecting some internet services for some of our customers.
“Phone calls and text messages are not affected in any way and are working as normal.
“We apologise for any inconvenience caused and we’re working to fix the issue as quickly as possible.”
EE customers reacted angrily to the outage, with many saying they had received no information from the network.