EE has confirmed it has fixed an issue which left some customers unable to make or receive calls over its 4G network.
The BT-owned firm, one of the largest network providers in the UK, said normal service had now resumed for all users.
Many had taken to social media earlier on Tuesday to complain of issues making or receiving phone calls on EE’s 4G network.
EE has not disclosed the cause of the issue.
“Earlier today some customers experienced intermittent problems making calls on 4G.
“Data services and text messages were not affected so customers were able to get online and use apps and messaging services as normal,” the company said in a statement.
“The issue was resolved for the majority of those affected within a few hours, and normal service has been restored for everyone.
“We apologise to our customers for the inconvenience caused as this is not the high standard of service they have come to expect of us.”
Earlier on Tuesday, service monitoring website Down Detector confirmed a problem with EE and reported receiving complaints from users in several parts of the country.
The website said it received reports of issues from users in London, Birmingham, Nottingham, Manchester, Bristol, Liverpool and Leeds, which began just after 8.30am.