O2 down: Data and 4G still not working as outage also hits GiffGaff and Tesco Mobile

The Independent 

O2's internet service is down, leaving customers of the network unable to get online. The problems mean those companies that share its network – such as GiffGaff and Tesco Mobile – are also being hit by the problems. Calls can still be made by customers despite 4G data connections are broken, O2 said. Affected phones, which may be every single device registered to the network, simply fail to show any kind of data connection and will not connect even when turned off and back on or when other workarounds are tried, according to users experiencing the problems. Some users also suggested SMS messaging was not working, leaving them unable to send texts.