Deleted Signal messages may not disappear
A security claim surfaced that deleted Signal messages can be exposed via phone push notifications, meaning deletion in-app may not remove all traces. The claim follows reporting that the FBI accessed Signal-related data through phone notification logs, raising attention to handset settings and notification privacy (crypto.news).
Deleting a Signal message does not necessarily erase the copy your phone may have stored in notifications. (404media.co) Signal’s own support pages say disappearing messages remove messages from devices after a timer expires, but also warn they are not meant for cases where the other person is the adversary. Signal also lets users choose whether notifications show “Name and message” or less detail. (signal.org, signal.org) The new concern is outside the app itself. 404 Media reported on April 9, 2026 that Federal Bureau of Investigation investigators extracted incoming Signal message copies from an iPhone notification database, even after the app had been deleted, according to people who heard testimony in a recent criminal case. (404media.co) Phone notifications work like little message postcards created by the operating system so alerts can appear on a lock screen or in a notification center. Apple says iPhone users can choose whether previews show full contents on the lock screen, and Google says Android users can hide sensitive notification content or turn lock-screen notifications off. (apple.com, support.google.com) That means a secure chat app can encrypt messages in transit and still leave readable fragments on the handset if notification previews are enabled. Signal’s support pages direct users to both in-app notification text controls and operating-system notification settings for Android and iPhone. (signal.org, signal.org) On iPhone, Apple says users can set “Show Previews” to “Always,” which displays notification contents on the lock screen without unlocking the device. Apple also says notifications can be viewed and managed from the lock screen and Notification Center. (apple.com, apple.com) On Android, Google says phones running Android 10 and later can keep a notification history, though availability varies by device, and users can choose to hide sensitive content on the lock screen. Signal separately notes Android 14 settings for lock-screen notifications and for suggested actions and replies in notifications. (support.google.com, signal.org) Google has also added Private Space, a separate profile that hides apps, notifications, settings, and recent activity when it is locked. The Android Open Source Project documentation says apps inside that space are hidden from notifications when the space is locked. (source.android.com, support.google.com) The reporting does not show that Signal’s end-to-end encryption was broken. It shows investigators allegedly recovered message content from phone-level notification records, a place users may not think about when they delete a chat. (404media.co, signal.org) For people who use disappearing messages as a privacy tool, the practical question is no longer just what the app deletes. It is also what the phone itself chose to save before the message disappeared. (404media.co, apple.com, support.google.com)
