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The server responds with the contacts that are Signal users and then immediately discards this information. Names are never transmitted, and the information is not stored on the servers. Signal periodically sends truncated cryptographically hashed phone numbers for contact discovery. Here’s how Signal’s documentation puts it: Signal does hash phone numbers and regularly sends them to its servers to help everyone discover which of their contacts is using Signal. No, Signal doesn’t store this information forever. So it’s fair to ask-is Signal uploading all your contacts and storing them forever? Some chat apps upload your contacts to the service’s servers, store them, and use them to match you with other people you know on that service. Does Signal Upload Your Contacts to Its Servers? Signal will not contact anyone in your contacts to let them know you’ve joined. They’ll see whatever name they have associated with your phone number in their contacts. To be clear: If someone else has your phone number in their contacts, they’ll get a message saying that you just joined Signal if your phone number is used to create a Signal account.
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Signal wants to let people know that they can now reach you on Signal and don’t have to use SMS. This message isn’t sent from your Signal app and will appear even if you don’t give Signal access to your contacts. When you join Signal, other people who have you in their contacts will see a message that you joined and are now reachable on Signal.
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What that means is, with access to your contacts, when you tap “New Message” in Signal, you’ll see a list of people you know who are using Signal.ĭoes Signal Tell Other People When You Join?