UK mobile networks such as O2, EE, Vodafone and 3 have gone down, leaving millions of people working from home stranded.
The networks began to fall at around 9am GMT, as people were signing into their devices. O2 says it is aware some users are having difficulties with their voice network and that they are investigating the issue.
The first issues were reported to Down Detector at about 9:14 GMT. O2, EE, Virgin, Tesco Mobile, Vodafone, BT, GiffGaff and 3 are all experiencing problems with their network.
There has been a spike in the number of office workers staying home to work after Prime Minister Boris Johnson urged people to avoid all unnecessary travel.
“Now is the time for everyone to stop non-essential contact with others and stop all non-essential travel,” Boris Johnson said at a press conference on Monday.
O2 released a statement saying that updates on progress to fix and repair the network will be released as soon as they are made available.