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Frequently Asked Questions

Yes, in that case you have to use your mobile data and you will be charged depending on your data plan.

Last updated: 28 10 2020

The Korona Stop LT updates the risk status at least every 24 hours. The actual time can lag behind for a few hours from the time of the day before.

Updating only around every 24 hours is due to API restrictions and to ensure consistency between the Korona Stop LT versions for iOS and Android.

Last updated: 28 10 2020

First of all: The app fulfills accessibility requirements and supports all accessibility features of your phone's operating system.

In general, you're not required to make phone calls in connection with the Korona Stop LT. In case of Covid-19 infection, you will get SMS with Case approval code, which you can enter into the app. .

Last updated: 28 10 2020

Yes, you can if you already had the Korona Stop LT installed before leaving to other country.

Last updated: 28 10 2020

This is how the app works:

  1. All devices that have the Korona Stop LT installed send and receive pseudonymized keys, which are saved locally on your device. A Bluetooth connection is only necessary for sending and receiving pseudonymized keys.
  2. If you are diagnosed with COVID-19, you can upload your diagnosis keys to the server. At regular intervals, all devices with the app receive these keys from this server and check if they have saved a matching key via Bluetooth. For uploading, your phone must be able to access the Internet, for example, using WiFi or mobile data.
  3. If there is a match between a key downloaded from the server and a key saved locally on your device, this means you were exposed to a person who has been diagnosed with COVID-19. Matching the encounters does not require a Bluetooth connection.
Last updated: 28 10 2020

Uninstalling the app should always be a last resort for solving one of the known or other issues with the app.

Since the app cannot delete the exposure logs by itself, whether they are cleared or not is a decision of the Exposure Notification Framework.

In the current version, uninstalling the app on iOS devices leaves the exposure log intact without any guarantees for the duration of storage.

On Android devices, the current implementation deletes the 'database and keys' from the device when uninstalling the app. Hence, you should expect that the collected random IDs are deleted when the app is uninstalled.

The way un-installation is handled can change without notice and without changes to the Corona-Warn-App itself. Therefore, only uninstall the app as a last resort to resolve an error and only when instructed to, e.g., by the hotline or developers on GitHub.

We recommend that before you re-install the app, you try clearing the app data first as this will not delete the random IDs:

  • On iOS devices, choose 'Settings' -> 'Reset App' on the home screen.
  • On Android devices, choose the three dots at the top right corner of the home screen and select 'Settings' -> 'Reset App'.
Last updated: 28 10 2020

No, they are not included in the backup. This also means that you can't restore the collected random IDs on the same or a different phone.

Last updated: 28 10 2020

If you transfer your data to a new iPhone using iTunes, or restore a backup, the app does not work properly. On the start screens, you end up in a loop, or the exposure logging cannot be activated. The risk status is not displayed.

Please reinstall the Korona Stop LT app on your new iPhone.

Last updated: 28 10 2020

Yes. The option in Control Center (see Use Bluetooth and Wi-Fi in Control Center) only disconnects your phone temporarily from any Bluetooth accessories that are currently connected. Bluetooth itself remains activated in the system settings.

Last updated: 28 10 2020

Then, encounters with the other phones that have the Korona Stop LT running are not logged, because the phones do not exchange the random IDs. Therefore, make sure to have Bluetooth and for Android, the location services, active whenever you meet someone, be it guests or when you're on the road.

For phones running Android, the location services have to be active, but the Korona Stop LT does not use the location information. You can deny other apps to use your location, if you want: see I'm asked to activate my location.

Last updated: 28 10 2020

Yes. As long as you have  activated exposure logging in the app and Bluetooth is on, encounters are logged in the background. The app itself doesn't have to be open for this. You can minimize it or use 'swipe-to-quit' to close it.

To be on the safe side, open the app once a day after 24 hours. You'll find more info at This is how the app works best.

For the risk status to be updated automatically, make sure that background updates are active . For all the info, see these FAQ:

Last updated: 28 10 2020

Date and time at which the check happened.

Last updated: 28 10 2020

This is the number of keys that your phone collected for which there is a matching diagnosis key. If the number is not 0, then you had an exposure. If your risk status stays green, that is, 'Low Risk'.

Last updated: 28 10 2020

For each day, there is an entry for each of the last 14 days.

Last updated: 28 10 2020

The Korona Stop LT app functions through private communication between phones. If you are heading somewhere and may come into contact with other people, it would be really beneficial to carry a phone with you that has the app for the best results. You should also make sure that your phone has Bluetooth turned on.

Last updated: 28 10 2020

If you were notified by the app, it only means that you have probably been in close contact with someone infected with the coronavirus. This does not mean that you will definitely get sick. It is now important to stay home and observe your symptoms. For example, if you have a dry cough, fever or breathing difficulties, please contact your family doctor who will arrange for you to be tested and treated. Additional information and recommendations will be provided in the App.

Last updated: 28 10 2020