Pocket Siren Forum 2026
Thank you to everyone who joined us in Tallinn and followed the live stream! The recording of the forum is available here.
Participants registered on site will receive the presentations by email. If you are interested as well, please contact pocketsiren@levira.com
Alerts straight to your pocket even when the mobile network is down
Pocket Siren is a pilot project that tested in 2025–2026 whether 5G Broadcast, transmitted from Levira’s high broadcast masts, is suitable for public warning in Estonia. The alert reaches the smartphone with sound, vibration and a full-screen warning. No SIM card, mobile data or app is needed.
A new channel alongside national public warning
Pocket Siren does not replace SMS alerts, sirens or radio. It adds a resilient channel to them that works independently of the mobile network.
The signal is broadcast the way TV and radio are: one transmitter serves every device in the coverage area at once. The network does not congest even when everyone needs the alert at the same time. The alert goes off even in silent mode and can be targeted to a specific danger area.
Besides text, the same network can carry TV and radio, which also means maps and video. The test network currently carries ETV and Vikerraadio.
Independent of mobile networks
Works even when the mobile network is overloaded or down.
Hard to miss
Sound, vibration and a full-screen warning, with optional text-to-speech.
Location-based
The alert is shown to devices inside the danger area. In Pärnu this worked correctly in all three scenarios.
More than text
The same network can carry TV and radio, maps and video alerts.
Pocket Siren in action
TV, maps and alerts reach the phone straight from the broadcast mast. The phone has no SIM card and no mobile data.
Pocket Siren Forum 2026
From Pilot to Public Service: Building a Safer Europe with 5G Broadcast.
The closing event of the Pocket Siren pilot presents the technical results and tester feedback, and shows a new version of the Pocket Siren app that sends event updates without triggering a new alarm.
Where we are now
Network built
3 high-power transmitters and 2 gap fillers, NAKOLOS core, CAP interface to EE-ALARMTests completed
3 scenario tests with end users, indoor tests in 13 shopping centres, drive tests across Estonia in 2025 and 2026Nationwide coverage model
20-site network, calibrated with more than 100,000 measurement recordsClosing event and final report
Pocket Siren Forum on 22 October 2026. The final report with conclusions and recommendations goes to the contracting authority.Latest updates
Pocket Siren Forum
The closing event of the pilot presents the technical results and tester feedback, and shows a new version of the app that sends event updates without triggering a new alarm.
Read more →Coverage model: 20 sites would reach ~96% of people
According to a model calibrated with the 2025 and 2026 drive tests, a 20-site network would cover about 84% of Estonia’s land area with public warning.
See the maps →Indoor measurements in 13 shopping centres
The Pocket Siren signal was detected at 79.3% of measurement points, and at every point in Kristiine Centre, Lasnamäe Centrum and Nautica Centre.
Read the results →Tests and demonstrations
Partners
Contracting authority and leads
Development and testing
