On Android (all app versions) and iOS (Threema version 2.9.0 and above), incoming messages can be decrypted in the background and presented along with a preview in the push notification. Push preview must be enabled in Threema settings for the preview to be shown.
If there is no Internet connection immediately after a push notification has been received, it is possible that no preview can be shown.
No preview will be shown on Android if:
Contact Names
On iOS, if there is no Internet connection immediately after a push notification has been received, it is possible that the real contact name cannot be shown.
If the real contact name cannot be shown, the “public nickname” is displayed instead. By default, it assumes the value of the user’s ID, but can be changed anytime. You can ask the sender to use their first name, for example. This will help you recognize the sender of a message.
