Britain's EE network down? Users unable to make or receive calls

UK's EE network is reportedly down, however, the company is yet to issue an official statement.

EE users are tweeting about the issues that they are facing as they struggle to make or receive phone calls.

Is the @EE network down? Can't make any phone calls

— TJP (@TilakJPatel) May 21, 2019

@EE can't make or receive any calls on your network. Turned phone off and on several times. can this be looked into. Thanks

— Trevor Bunch (@TrevorGBunch) May 21, 2019