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Threema. The Secure Messenger Not Working? Fixes (2026)

Common Threema. The Secure Messenger problems and how to fix them — updated 2026-07-04.

Threema. The Secure Messenger not working or crashing

If Threema is crashing or not functioning properly, try updating the app and your iOS to the latest versions. Restart your device and check if you have sufficient storage space. If issues persist, consider reinstalling the app and ensuring it has the necessary permissions.

Cannot send or receive messages

If you are unable to send or receive messages, first check your internet connection. Ensure that your contacts are using Threema and that your Threema ID is correctly shared. If problems continue, restarting the app may help.

How to delete or reset data/account if applicable

To delete your Threema account, navigate to the app settings and select the option to delete your account. This action will remove all your data, including contacts and message history, so proceed with caution.