More than 1.2 million Orange users found themselves without a service following a fault in the company's network.
Customers started to experience difficulties at 3.30pm on Monday as the telco's wide area network, which enables the service to locate where a customer is, developed a glitch.
An Orange spokesman explained that equipment on the network was found to be faulty and that it sent out its own engineers, along with those of its suppliers, to fix the fault. It was given the all clear at 11.00pm.
Many users had to redial a number of times before they successfully connected, and some experienced no signal on their handsets and were unable even to dial out.
"It's not a normal problem in any sense. We don't have that problem on a regular basis," said the spokesman. "We regret any inconvenience caused to our customers."
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