Sometimes, you might open a new message when you’re busy and forget to reply later. That’s why marking messages as unread can remind you that you didn’t answer and can do it when you have time. Here’s how to mark messages as unread across devices: For Android Users 1. Launch Signal on your device and find a chat with messages you want to mark as unread. Tap and hold the chat. 2. On the pop-up menu, tap on “Unread.” For iOS Users 1. Launch Signal on your iOS device. 2. Hold the chat you want to mark as unread and swipe right. 3. Press “Unread.” On Desktop Marking messages as unread on a desktop is only available in Signal 1.38.0 or later. 1. Select a chat you want to mark as unread. 2. Head over to the conversation settings. It’s the three vertical dots in the upper right corner of the screen. 3. Click “Mark as unread.”