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Signal tests usernames so you can avoid sharing your phone number
(www.theverge.com)
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this post was submitted on 09 Nov 2023
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Technology
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The phone calls just use fake caller ID. Caller ID is entirely unauthenticated and the recipient just blindly trusts the sender, so scammers use sketchy VoIP services that let you override the caller ID without actually proving you own that number. Work is being done to improve this: https://www.fcc.gov/call-authentication
That's means it's trivial to use a fake number for outgoing calls, but the spammers can't actually receive incoming calls or texts to those numbers.