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It just does. Your phone can check by itself if someone is on signal or not - no upload of contacts needed.

Well, I’d say they can do that as long as it stays on my device like with Signal.

Sticking to Signal is really the best option

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The privacy policy doesn’t matter if no data is saved unencrypted or with no metatdata.

The only thing Signal saves (which is proofed by a law case afaik) is the phone number and the account creation date.

It’s overpriced all the times tho

Not an application

Well imap isn’t encrypted, right? That’s why one can or rather needs to run a software with proton called proton bridge to get imap locally