O2 has revealed that one of its third party suppliers had a software issue that caused the outage.
O2 is experiencing problems as the network has gone down across the UK.
Customers reported experiencing problems with 4G and data services leaving them unable to access the internet.
The network issues appeared to start shortly after 5.30am this morning.
Outages were reported across the UK, including Manchester, London and Southampton.
The company confirmed the network issues on Twitter, saying: “Our technical teams are investigating reports of issues when using data.
And while O2 says that voice calls are ‘working OK’, many users have reported that this isn’t the case.
O2 has now confirmed the cause of the outage.
It tweeted: “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.”
Outage Update: 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.
— O2 in the UK (@O2) December 6, 2018
giffgaff, which uses the O2 network, is also down for users across the UK.
giffgaff tweeted: “Morning folks. We’re aware that our members are currently unable to use data services. We’re working hard to get everything back to normal for you as soon as possible. We’ll keep you updated.”
Bizarrely, it seems that London live bus information also runs on the O2 network, meaning commuters in the capital have been left without information on buses or at bus stops.
Many users took to social media to voice their frustration.
Sacha Boljevic wrote: “No O2 3G/4G network for me this morning. It may as well always be down in Manchester CC – 4G constantly congested and unusable for years now – would leave if it was easier to ditch the contract.”
.@O2 your network is currently down #o2isdown. My Internet isn’t working, tweeted this using London Underground 🚇 WiFi on my commute to work. Mine and many others reaction right now👇🏼😡 pic.twitter.com/rjb7xUH3Kd
— AMINUR RAHMAN امين (AMIN) (@Aminurahman) December 6, 2018
Emily-Kate Brewer posted: “After having several masts down in my area for weeks and not being able to make or receive calls. I’ve now woken this morning to no data. My partner is now having to navigate his own way round London with no sat nav. Really not good enough!!!”
Mark Francis tweeted: “There is no O2 network at all it seems, which basically means the world’s about to end right? Although must say it is strangely liberating at the moment.”
Ernest Doku, mobiles expert at uSwitch.com, said: “O2 users affected by this mobile data outage will understandably be concerned and frustrated.
“While it’s positive that voice calls are still up and running, without a projected timeframe for a fix, this is likely a worrying situation for a large proportion of O2’s some 32 million UK customers.
“Customers who are suffering can keep a track of this incident using O2’s own network status tracker and ask the provider to keep them posted.
“In the meantime, O2 customers can still place and receive calls, but will have to resort to using WIFI if they want to get online.
“For the millions of users who are out and about and rely on smartphone maps to get around, it’s worth considering that apps like Google Maps allow customers to download maps on WIFI and view them offline.
“With little idea of when this problem will be sorted, it’s worth preparing before heading out to make sure you’re not caught out by this data downtime.”