Alert RCB in Poland: Emergency SMS and Sirens Explained
Short answer: Alert RCB is Poland's free emergency SMS. You need no signup or app: phones in the threatened area get it automatically. Sirens have set signals, and a 3-minute modulated tone means an alarm.
If your phone suddenly buzzes with a loud text message from "Alert RCB" while you are in Poland, it is the government's emergency warning system, and it is real. The Government Centre for Security (Rządowe Centrum Bezpieczeństwa, RCB) sends these SMS messages only when there is a likely direct threat to life or health over a significant area. You do not need to sign up, install an app or pay anything. This guide explains how the alerts work, who gets them, and what the sirens in Polish towns mean. It is based on the official gov.pl pages of the RCB and the Ministry of the Interior and Administration (MSWiA), read in October 2026.
What Alert RCB is
According to the RCB, Alert RCB is an SMS notification system for people at risk. It is used in emergencies, when there is a probability of a direct threat to life or health in a significant area. The messages are based on information from ministries and services such as the police, the State Fire Service and the Border Guard, from central institutions like the Institute of Meteorology and Water Management (IMGW), and from voivodeship offices. The RCB monitors the situation 24 hours a day, 7 days a week, and launches an alert when needed.
The MSWiA adds that the system is used only in extraordinary situations. In its recent communication it says alerts were used during military activity and after information about a probable threat from the air.
Do you need to sign up?
No. The RCB states plainly that you do not need to register for the alert. People who are in the area of potential danger receive an SMS on their mobile phone, and it does not matter which network the phone is on. Mobile operators are obliged to send the message immediately to all users in the area set by the director of the RCB.
A few practical points from the RCB's question-and-answer page:
- It is not part of the RSO app (Regionalny System Ostrzegania), and you do not have to install any app to get the alert.
- You do not need to change any settings. The phone only has to be switched on and within range of the mobile network.
- Prepaid users are covered. The RCB says prepaid phones also receive the messages.
- The messages are free. No operator may charge extra for them, and the RCB does not pay the operators for sending them.
- A foreign SIM or a Polish SIM does not appear in the official answer as a separate case, so do not assume that a roaming phone is covered. If it matters to you, a Polish SIM card removes the doubt. See our guide to getting a Polish SIM card or eSIM.
How does it know where you are?
The RCB explains that the operators send the alert to the areas chosen by the RCB director. What matters is whether your phone is in range of a base station (BTS) located in the area of the potential threat. The smallest area that an alert can be sent to is a powiat (county). The RCB says it does not collect or process your personal data, and that the operators do not hand databases to the RCB.
This also explains why you sometimes do not get an alert even if the weather looks bad. The RCB notes that not every weather event carries a direct threat to life and health, and that the level of danger comes partly from IMGW forecasts. Local events that are hard to predict, such as a gust of wind toppling a damaged tree, may not trigger an alert, so keep the basic safety rules in mind either way.
What to do when the alert arrives
The official advice is short: follow what the message says. That helps you avoid the danger or reduce its effects.
The official pages do not say that the text is also sent in English, so expect it in Polish. If you cannot read it, a translation app on your phone helps, and a Polish-speaking neighbour, colleague or landlord can help too. Save the emergency numbers as well, as described in our guide to emergency numbers in Poland.
Alert RCB and the sirens
The MSWiA reminds residents that there are other ways of warning people besides SMS: messages in the RSO app and on its website, announcements by local authorities and media, and sirens. Some sirens can also play voice messages. Per the MSWiA, the signals are:
- Alarm for the civil population: a modulated siren sound for 3 minutes, plus a spoken message repeated three times, "Uwaga! Ogłaszam alarm..." ("Attention! I am announcing an alarm").
- Cancelling the alarm: a continuous siren sound for 3 minutes, plus the spoken message "Uwaga! Odwołuję alarm..." ("Attention! I am cancelling the alarm").
- Alarm for a fire protection unit: a rising and falling siren tone repeated three times with 30-second pauses, lasting 3 minutes.
- Training alarm: a continuous siren sound for 1 minute.
The MSWiA says the visual sign to recognise is a yellow triangle, which may appear in public places, on service vehicles and in the media. Voivodes also run siren exercises. They must tell the media at least a day before such an exercise.
What to do if you hear a siren
The MSWiA's key advice is to stay calm, follow spoken instructions and take protective action as soon as you can. If you hear an alarm siren:
1. Turn on a radio or TV to a local station, listen to the announcements and follow the instructions.
2. Check where the people living with you or close to you are, and tell them about the danger.
3. If you are away from home, contact your family or friends, tell them what is happening and where you are, and agree how you will stay in touch.
The ministry also points to a "safety guide" (Poradnik bezpieczeństwa) prepared jointly by the Ministry of National Defence, the MSWiA and the RCB. It covers topics such as extreme weather, floods, cyber attacks and disinformation, and is on the gov.pl website.
Tips for expats
- Keep your phone charged and switched on, and do not turn off emergency alerts in its settings.
- Teach everyone in your household what the alert looks like. The RCB says there is no way to stop a child's phone from receiving it, and recommends talking to children about it. If a child gets an alert at school, they should follow the school's procedures.
- Learn the three or four Polish words that matter: "alarm" (alarm), "zagrożenie" (threat), "schron" (shelter) and "ewakuacja" (evacuation).
Frequently asked questions
Do I need to register for Alert RCB?
No. Anyone in the area of the threat receives the SMS automatically, on any network, and no app is needed.
Is Alert RCB free?
Yes. The RCB says the warning SMS messages are free and operators may not charge for them.
Do prepaid phones get the alert?
Yes. The RCB says prepaid users are covered by the system.
How big is the area for an alert?
The smallest area is a powiat (county). Whether you receive it depends on your phone being in range of a base station in the threatened area.
What does a 3-minute modulated siren mean?
According to the MSWiA, it is the alarm signal for the civil population. A continuous 3-minute siren means the alarm is cancelled.
