How to Send Disappearing Messages in Signal Khamosh Pathak Don’t want your messages sent through Signal to remain on someone’s phone? You can use the Disappearing Messages feature to automatically delete all messages in a chat after a set time. Here’s how to send disappearing messages in Signal. The Disappearing Messages feature works on a per-chat basis. It works for both one-on-one chats and groups. You can choose between one-second and one-week time frames (This is something you can’t do on WhatsApp.). The app shows a visual timer next to disappearing messages. Disappearing messages are not a fool-proof privacy feature. Users can still forward messages, take screenshots, and even save the shared media to their camera roll before it’s deleted.