- What do the symbols next to a message mean?
- Why do messages to certain contacts not appear as read?
- How can I tell whether the app is connected to the server?
- Why are incoming messages sometimes delayed or only arrive once I open the app?
- How can I send emojis?
- Why don't previews in push notifications work properly?
- Why doesn’t my chat partner receive my messages?
- How can I make sure this is working when I don't know anybody who has installed it yet?
- How long do messages stay in queue for delivery?
- I am receiving unwanted messages. What can I do?
- Why can't I send a video?
- How can I mute individual chats?
- What does it cost to send a message?
- Which ports need to be open on my network?
Why don't previews in push notifications work properly?
On Android (all app versions) and iOS (Threema version 2.9.0 and up), 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:
- the master key is locked, or
- PIN protection is activated, or
- background data is restricted
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 e.g. his or her first name. This will help you recognize the sender of a message.