Three has apologised after more than ten thousand people in the UK reported they were left without mobile service.
Downdetector, which tracks outages, showed over 12,000 people reported their services, including calling and using mobile data, were not working.
It is the latest outage to hit Three, after it apologised on both Saturday and Sunday over similar incidents.
Three said it was “very sorry for the issues with service over the past few days”.
“Following an issue with our network that started earlier, services are recovering,” a spokesperson said in a statement.
“We appreciate a number of our customers are still waiting on their service to be restored and our engineers are working to fully fix it.
“Our customer service channels continue to be unavailable, so please check our social feeds for the latest updates.”
Three has around 10.5m customers across the UK, according to its website.
Reports began over the latest incident at 1000 GMT on 12 February.