Christopher BellThe UK's Emergency Alert System is trending across search engines this week, with hundreds of thousands of Britons asking what the system actually does with their phone data. The system — launched in April 2023 and last tested UK-wide in September 2025 — can broadcast warnings to any 4G or 5G device in a geographic area, without requiring an opt-in. But in an era of growing cybersecurity awareness, questions around data privacy, spoofing risks, and what the system can and cannot see about your device deserve clear answers from IT experts.
How the Emergency Alert System Actually Works
The UK Emergency Alert System uses Cell Broadcast technology — a one-directional broadcast sent from mobile masts to all compatible devices within a defined geographic area. According to the UK Government's official guidance, the system does not require your phone number, does not track your location, and cannot collect any personal data.
Unlike a text message (which goes to a specific number), a Cell Broadcast is like a radio signal: it is sent to all devices in range simultaneously. The government, the police, or emergency services cannot send a message to a specific individual's phone through the Emergency Alert System.
This is an important distinction — and one that IT security professionals emphasise when advising clients:
- The system cannot see your phone number
- The system cannot track your real-time location
- The system cannot read your messages or access your device
- Alerts will always come from a system number, not a personal number
The Real Risk: Spoofing and Phishing That Piggyback on Alerts
While the official Emergency Alert System is technically secure, it creates an indirect cybersecurity risk: criminals exploit public uncertainty about alerts to launch convincing phishing campaigns.
After both the 2023 launch and the 2025 nationwide test, cybersecurity firms documented a spike in:
- SMS phishing messages (smishing) designed to look like follow-up emergency communications
- Fraudulent websites claiming to "register" your device for emergency alerts (registration is automatic — no website is needed)
- Phone calls from scammers claiming to be from emergency services, using the alert as a pretext for requesting personal information
The pattern is consistent: a high-profile public event — a real emergency alert, a government announcement, a major news story — generates confusion, and criminals exploit that confusion window. IT security experts call this "event-triggered phishing."
What IT Professionals Recommend
For individuals and small business owners, the guidance is clear and actionable:
1. Never click links in messages that arrive alongside or after an alert
The UK Government and emergency services will never send a follow-up text asking you to verify your details, update your settings, or click a link in response to an alert. If you receive such a message, it is a scam.
2. Verify alert authenticity through official channels only
If you receive an alert and are unsure whether it is legitimate, check the gov.uk/alerts website directly (type the URL manually — never follow a link). The government publishes schedules for system tests.
3. Update your devices and apps regularly
Emergency alerts are received through the device's baseband chip, not an app — so your apps cannot block them. However, outdated devices may be more vulnerable to the surrounding phishing ecosystem. Keeping your operating system and security apps updated closes known vulnerabilities that criminals exploit in the days after high-profile events.
4. Educate your team if you run a business
For businesses, the moment after a national emergency alert is a high-risk window for socially engineered attacks against employees. A brief team reminder — "be cautious of unusual emails and texts today" — can prevent costly mistakes.
Why This Matters for UK Businesses
Small and medium businesses are disproportionately targeted by event-triggered phishing. Unlike large corporations with dedicated security operations centres, SMEs typically lack real-time threat monitoring. A well-timed phishing email referencing a genuine national event — like an emergency alert — can bypass employee suspicion and lead to credential theft, ransomware, or financial fraud.
The cost of a successful cyberattack on a UK SME averaged £3,230 in direct costs in recent years, before accounting for reputational damage and operational disruption. A one-hour consultation with an IT security specialist to review your business's phishing resilience is a fraction of that cost.
How to Stay Protected Going Forward
The UK's Emergency Alert System is a genuinely useful public safety tool. The risk is not the system itself — it is the criminal ecosystem that attaches itself to public confusion about the system.
Protecting yourself and your business means understanding how the system works, what it cannot do, and staying alert to the social engineering campaigns that emerge after each high-profile event. An IT security consultant can audit your current defences, train your team on phishing recognition, and recommend the right tools for your budget.
For expert IT guidance from professionals who understand UK cybersecurity needs, Expert Zoom connects you with qualified IT specialists across the UK — available for quick consultations without long waiting times.
