Published Thursday, 12 July 2012
Customers reported loss of service from Wednesday lunchtime. (© Getty)
The phone network has confirmed that 2G and 3G services have been fully restored.
O2 has said that customers still having problems should they turn their phone off and on again.
They apologised again to all customers affected.
Thousands of customers had experienced problems with using their phones, with problems reportedly starting at lunchtime on Wednesday.
In an earlier statement the phone network said the service problem was due to a fault in a network system which meant mobile phone numbers were not registering correctly on their network.
As a result, some customers had difficulty making or receiving calls, sending texts or using data.
"We are sorry again for the inconvenience this has caused some customers and can provide reassurance that we continue to deploy all possible resources, and will do so until full service is restored," O2 said in an earlier statement.
© UTV News