"One of our 3rd party suppliers has identified a software issue in their system. Our technical teams are working extremely hard to resolve this. We'd encourage you to use Wi-Fi wherever you can and we are really sorry."
A total of 32 million customers are thought to have been affected with phones simply failing to show any data connection.
Also Japanese customers are affected. It's a very expensive outage for the users with O2 quoting that the small print says that they cannot guaranteed the service, presumably to avoid compensation claims.
I think that this may not wash as it might with a private user for all those that effectively have had to stop trading while it's out.
Said to be a software upgrade problem it's as bad as the TSB software undate that went wrong!
Ericsson makes network equipment that's used by O2, and the problem seems to be with related software.
The outage is huge, and it's affecting customers in other countries as well as the UK. It's also having knock-on effects for other services that use the O2 network, including Transport for London's electronic timetable service at bus stops, which has stopped working.
Many other businesses and public services are affected - there will be lots of compensation claims from them. It all goes to show how we have become highly dependent on these networks.