I forgot my PIN/passphrase/lock code. What can I do now?
Lost passphrases, PIN codes, and lock codes cannot be recovered. However, you can reset the app, and then set it up again. Please note: Unless you have a backup, you will lose all saved messages and your Threema ID.
Android: Delete the app data in Settings > Apps > Threema > Clear data.
iOS: Enter a wrong code ten times. A button will appear in the upper left-hand corner that allows you to reset the app data.
Windows Phone: Delete Threema, and reinstall it. All app data will be removed.