1. Data problems hit O2 mobile network BBC News
  2. Millions of O2 customers offline amid mobile data blackout ITV News
  3. Tesco Mobile DOWN - 4G network NOT WORKING as customers face a major outage Express
  4. O2 down: Data and 4G stops working across UK as Tesco Mobile and GiffGaff users also hit Evening Standard
  5. View full coverage on Google News