Three UK Outage Explained: What Caused the Epic Voice Failure?
1. What Happened? Nationwide Voice Outage
On June 25, 2025, from about 7:45 am BST, Three UK experienced a widespread voice and SMS failure, lasting over 12 hours. The problem was not limited to Three—MVNOs like Smarty and iD Mobile were also affected.
2. Data Stayed Online
Although voice and SMS were hit hard, mobile data services remained mostly unaffected, which meant internet usage, apps, and streaming remained functional .
3. How Bad Was It?
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Peak impact: Over 9,300 reports on Down Detector at its worst.
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Reports were nationwide, affecting major cities like London, Manchester, Glasgow as well as Eaton smaller cities like Plymouth and Hull.
4. Three’s Response
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First public acknowledgment appeared around 9:30 am BST, saying they were “working hard” to fix the issue.
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At 10 pm, they announced voice and SMS were “returning to near-normal levels”, while continuing to monitor the situation.
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However, many users still reported problems the next morning.
5. Why Communication Disappointed Users
Customers expressed frustration on social platforms:
“It’s the lack of information that really stings”.
Three's updates were sparse and vague, which left customers unsure about how long the outage would last.
6. Your Rights & Compensation
UK telecom regulator Of com states providers should offer refunds or compensation for long service failures. Here's what you can do:
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File a complaint via Three’s official support channels.
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If no resolution after 8 weeks, escalate to an Alternative Dispute Resolution (ADR) scheme.
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Social media user reports suggest they received £40–£5 credit following incident complaints .
7. Tips for Affected Users
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Restart your phone to help reconnect to the network.
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Use Wi-Fi calling, messaging apps (WhatsApp, Signal), or landlines during the outage.
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Monitor Down detector for real-time issue reports.
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Keep records of outage times and communication attempts for any future complaint.
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