Mobile operator three confirmed that some users are currently unable to make phone calls.
One in Post on XThe network said that “there was an issue affecting voice services”, but did not say how many Its 11 million customers are affected.
The outage website dowater on Wednesday reported a spike in issues on 09:30 BST, in which more than 9,000 reports were made by users.
According to three, data services such as 4G and 5G are working normally.
The company recently completed a merger with Vodafone to create the UK’s largest phone network with around 27 million customers.
Vodafone services are normally running.
However, other phone companies that affect piggiback from a network of three.
ID Mobile posted on its service status page: “Please bear with us, our technical teams are working hard with our network partner Three UK to fix this issue and the entire service will be restored as soon as possible.”
Smart said it was “aware of the issue affecting voice services” and was working to fix it.
Some customers posted on social media, saying that they are unable to return missed calls from the hospital, or to call the car breakdown service.
Others also said that they did not have access to data services on Wednesday morning – although in a statement, the three said that the data is “working normally”.
In January, all three announced a small number of users’ check, who were not able to call 999 during network outage.