LU-Alert: Luxembourg will test the alert system on 5 May

On Monday 5 May 2025, the Luxembourg government will continue its strategy of testing the LU-Alert national emergency alert system. As every month, at 11:00 a.m., sirens will be tested throughout the country and the Cell Broadcast (CB) system, a technology that allows emergency notifications to be sent to mobile phones, will be tested.

This time, notification via Cell Broadcast will only be received on devices where the "LU-Alert Test" option is manually activated, which is disabled by default:

• For Apple users: you need to go to "Settings → Notifications" and enable "LU-Alert Test" at the bottom of the list;
• For Android: the setting is under "Security & Emergencies → Wireless Emergency Alerts".

If you decide to activate the notification, warn your loved ones: the notification is accompanied by a loud beep and vibration, even if the phone is in silent mode or locked. This can be frightening, especially if the person does not know it is a test.