this post was submitted on 26 Nov 2023
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Privacy
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It confirms that your number is valid and in use.
You can check that in the phone app too. Hit new message, enter the numer, hit "New message to... " and it'll tell you if it isn't known. There is rate limiting in that function, you'd need a lot of signal accounts to sweep all phone numbers.
You could also try signing up to signal using the number you want to check.
Neither way however you would get the signal name or profile pic of the number if I understand it correctly, that would get sent if they reply to you.
It's a necessary feature if you are using phone numbers. Signal has to tell you if your message has any chance of being received.
I don't want to message someones number, to find out they never got my message and don't have signal a few days later, and I don't want to message them via whatsapp too, giving them a chance to use that when they have signal.
I mean, ever heard of a phonebook?