O2 apologises for major network outage across UK

People in densely populated areas reported being unable to use their O2 devicesThe telecommunications network O2 has apologised after its service went down on Thursday afternoon, leading to thousands of complaints from customers across the UK who were unable to use their mobile phones.People in the most densely populated areas of all four UK nations reported being unable to use their O2 devices, according to the online tracking service Down Detector. In response, O2 said its engineers were looki