"This afternoon the Vodafone network had an issue affecting broadband, 4G and 5G services," a company spokesperson said.
"2G voice calls and SMS messaging were unaffected and the network is now recovering.
"We apologise for any inconvenience this caused our customers."
It comes after people on social media said they were struggling to access Vodafone customer service operators, amid ongoing issues affecting mobile data and broadband.
Many also said they have had difficulty accessing the company's website and app, which typically allow people to view the status of its network services.
Customers have also taken to social media to complain of "complete outages" in their area.
The issues appear to have begun for customers shortly after 15:00 BST.
Internet monitor Netblocks said in a post on X, external that live network data showed Vodafone was experiencing "a national outage" impacting both broadband and mobile data.
Some customers expressed being doubly frustrated by not being able to access their Wi-Fi or mobile data.
"Sort it out soon please," wrote one frustrated X user - who said they were having to use a coffee shop's Wi-Fi to access online services, without the means to do so using their mobile data or broadband.
Another said they were self-employed and could not work because of the outage, adding: "Never regretted more having my mobile and broadband on the same network."
The issues are also understood to have impacted some Vodafone shops.