FBI Recovered Deleted Signal Messages Through iPhone Notifications

The FBI reportedly retrieved incoming Signal messages from a defendant’s iPhone not by accessing the Signal app, but by scraping the device’s push notification database to capture alerts that displayed messages on the Lock Screen, even after the app was deleted. Signal users can mitigate this by enabling notification content blocking (Settings > Notification Content > No Name or Content) to prevent revealing who a message is from or what it contains; note that any app displaying lock-screen previews can create a similar vulnerability.