Vodafone appears to be growing rapidly, with mobile and domestic broadband customers across the UK claiming that they are unable to access the network.
Problems started at about 14:42 BST, according to DownDetector website, which monitors online fractures.
Customers in London, Glasgow, Manchester, Birmingham, Nottingham, Bristol, Liverpool and Leeds reported all issues.
Elsewhere in Europe, Vodafone customers have problems in Spain, Ireland, Italy, Germany, Greece and Portugal.
"Gigantic Vodafone right to affect European users at least, " tweeted Ian Kenefick, senior cyber security engineer at Trend Micro.
Vodafone acknowledged the break through the medium of Irish Irish Twitter account.
"We are currently investigating an outbreak of our fixed and mobile services," the company put tweeted. "We thank you for your patience as we work to resolve this."
Vodafone has around 19.5 million customers in the UK, and almost 444 million worldwide.
Hundreds brought social media to complain about the defense:
"We understand that some customers have problems with their mobile data and broadband services," Vodafone told Mirror Online in a statement.
“Our engineers are working hard to fix the issue and services are now being refurbished. This might take some time before they work as normal. Sorry for any inconvenience caused.
One delegate to DownDetector suggested that the problem with Vodafone DNS servers, which helps to transmit traffic across the network.
"Change dNS or DNS Forwarder to Google's Public 22.214.171.124 and you will get most of the Internet back," he said.
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