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FBI Extracts Suspect’s Deleted Signal Messages Saved in iPhone Notification Database
(www.404media.co)
this post was submitted on 09 Apr 2026
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Local, on-device apps don't need to go through FCM or any other servers to show notifications, apps generate notifications offline.
Same goes for Signal, it doesn't ask FCM to deliver a notification, it asks to deliver a wakeup ping, and then the Signal app gets the message and generates a notification locally.