Overview

• Mobile networks including O2, EE, Vodafone and Three are texting customers this week to flag the UK-wide drill and direct them to gov.uk/alerts.
• Only compatible 4G/5G devices will receive the test; iPhones need iOS 14.5 or later and Android phones or tablets typically need Android 11 or later, while switched-off, 2G/3G or Wi‑Fi‑only devices will not get it.
• The alert will trigger a loud siren-like tone, vibration and an on-screen test message for about 10 seconds, with no action required from users.
• Refuge and Solace urge domestic abuse survivors with hidden phones to disable alerts in settings before Sunday, with opt-out steps provided for iPhone and Android.
• Motoring and venue guidance warns drivers not to handle phones and advises theatres to remind audiences to switch devices off, as officials cite lessons learned and real-world uses during severe storms and a Plymouth bomb incident.