If you use Signal do this on your iPhone
Go to iOS Settings → Notifications → [App Name] → Show Previews and set it to Never.
You can also do this globally under Settings → Notifications → Show Previews → Never
Lifehacker
How the FBI Extracted Deleted Signal Messages From a Defendant
The FBI was able to pull Signal messages from a defendant's iPhone—even though that user had deleted the app. Here's how they did it.
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