Many O2 customers are claiming they are still experiencing problems with the phone network, even though the company announced earlier that data services had been restored.
Millions of O2 customers were left without data access yesterday as a result of 'faulty software'.
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This morning, the company released a statement, claiming that the problem had been fixed.
The statement read: "We can now report that our 4G network has been restored. Our technical teams will continue to monitor service performance closely over the next few days to ensure we remain stable. A review will be carried out with Ericsson to understand fully what happened.
"We'd like to thank our customers for their patience during the loss of service on Thursday 6 December and we're sorry for any impact the issue may have caused."
However, many customers have taken to social media, claiming they are still experiencing problems with the mobile operator:
Yesterday, 02 boss, Mark Evans, issued an apology on behalf of the company.
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He said: "I want to let our customers know how sorry I am for the impact our network data issue has had on them, and reassure them that our teams, together with Ericsson, are doing everything we can.
"We will continue to work with Ericsson, through the night, who have assured us that a full service will be restored for customers by the morning. We fully appreciate it's been a poor experience and we are really sorry."
However, some people seemed grateful for the data outage, or thought that people were generally overreacting to the problem: