The outage is also affecting the ID Mobile and Smarty networks, which are owned by Three Mobile.
There are also reports for Vodafone, EE, and 02 networks.
According to Down Detector, issues began shortly after 8am, peaking at over 9,300 reports.
According to customer reports, 79 per cent of affected users are unable to make voice calls with a further 17 per cent unable to access phone signal.
@ThreeUK @ThreeUKSupport your network status web page and mobile network are both down. Seems lots are searching it up too pic.twitter.com/OHueXCLbZk
— Chris Danks 🔋🚗🔌 🇬🇧 🇺🇸📐📐 (@christesla) June 25, 2025
In a statement posted on X, formerly Twitter, Three UK wrote: ‘We’re aware of an issue affecting voice services and are working hard to fix it.
‘Data services are working normally. Please accept our apologies for any inconvenience caused.’
We’re aware of an issue affecting voice services and are working hard to fix it. Data services are working normally. Please accept our apologies for any inconvenience caused.
— Three UK (@ThreeUK) June 25, 2025
Last week saw the completion of a merger of Three and Vodafone, which they told customers about in an email, saying they were “building you our best ever network.”
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The email continued: “By bringing the two networks together you will enjoy expanded coverage, faster streaming and even better reliability.
“Through continuous network upgrades, we’ll provide better-quality connectivity and faster speeds for our customers.
“We’ll offer super-fast broadband to millions more of you, by combining our 5G Broadband with the UK’s largest full fibre footprint.”
