It has confirmed engineers are working to fix the issue.
CUSTOMERS WHO rely on the O2 mobile network are waking up to a whole crock of bork this morning, as a major outage affects customers on the United Kingdom number two provider and its dependencies.
"This remains our priority and we apologise to our customers for any inconvenience".
"We are aware of the issue and are working together with our customers to solve it as soon as possible", an Ericsson spokesman said.
Ericsson said that, with the cause of the issue now isolated, it was working to get all of its customers back online. "We fully appreciate it's been a poor experience and we are really sorry".
At 1:39 pm on Thursday, December 6, 2018, the SoftBank Network Center detected software's malfunction in all of the packet switching machines manufactured by Ericsson, which are installed at the Tokyo Center and the Osaka Center, covering mobile customers nationwide.
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"The faulty software that has caused these issues is being decommissioned and we apologize not only to our customers but also to their customers", Ekholm said.
The problems mean that the companies that share its network - such as GiffGaff, Sky Mobile and Tesco Mobile - are also being hit by the problems.
What are your rights about claiming compensation?
However, when the network was down for seven hours in 2015, the company did not offer compensation to all customers, instead saying payouts would be assessed on a "case-by-case" basis.
If your problem is still unresolved after eight weeks you can submit your complaint to an independent Alternative Dispute Resolution (ADR) scheme.
For more information, visit the Ofcom website.