The FBI recently opened the Signal documents on the iPhone. Here’s how to close yours
Signal has long been one of the most secure messaging apps available. It uses end-to-end encryption, collects very little data, and offers features like disappearing messages to keep conversations private. For many users, it is the go-to app where privacy is important. While that hasn’t changed, the latest situation shows how parts of your conversation can still be exposed. The good news is that there is an easy way to prevent this.
How the FBI found Signal messages on an iPhone
According to a report by 404 Media, the FBI was recently able to recover deleted Signal messages from an iPhone. The method did not include breaking Signal’s encryption. Instead, investigators retrieved the messages from data stored by iOS itself.
To understand how this works, it helps to know how iPhones handle notifications. When message preview is enabled, iOS temporarily stores parts of incoming messages to display in the notification preview. That data can persist outside of the app, even after messages within Signal are deleted or the app itself is deleted.
In this case, the FBI has reportedly released a preview of the cached notices. Only incoming messages have been received, based on available data, but that still means that part of the conversation may exist beyond Signal’s encrypted environment.
Note that this is not an error in Signal encryption. Messages remain secure on the go and within the app. The problem lies in how iOS handles simple features like notification previews, which can create a second copy of message content.
How to stop your iPhone from displaying Signal messages
There are two ways to connect this port. One involves changing your iPhone’s settings, while the other focuses on Signal itself. The former stops iOS from saving message previews, while the latter limits what the app allows to be displayed outside of its encrypted environment.
If you don’t want iOS to make a copy of message content, you should disable notification preview. To do this, go to Settings > Notifications > Show previewsand set to “When On” or “Never.” The first option ensures that the content of the message is only shown in the preview when your phone is on, while the second prevents the preview altogether and is a safer option.
This method works well when you use multiple apps in private chats, as it doesn’t need to adjust the settings one by one. However, if you still want to preview other apps while disabling them in Signal, you can adjust the app’s settings instead.
Open Signal, tap the profile icon in the upper left corner, and go to Settings > Notifications. Then tap “Show” under the content section of the notification and choose “Name Only” or “No Name or Content.” This prevents the content of the message from appearing in the notification preview while still allowing you to receive alerts.
What does this mean for your privacy?
This is not something most users need to worry about on a daily basis. The type of data extraction used in this scenario requires physical access to the device and is not a widespread vulnerability exploited by authorities.
But it does highlight how privacy works in practice. Using a secure app is only part of the equation. The operating system, its default settings, and even small features can affect how well your data is protected.
Signal is still one of the safest messaging apps you can use. But if you rely on it for private conversations, it’s worth taking a few minutes to make sure your iPhone isn’t undermining that security.
