Signal is removing its phone number requirement for new sign-ups, allowing users to register with a one-time payment instead of SMS verification. This change aims to enhance security by mitigating risks like SIM-swap attacks. However, experts caution that AI advancements can still identify users through metadata such as message timing and contact patterns, even without direct personal information. AI
IMPACT This change enhances user privacy on Signal, but AI's ability to infer identity from metadata remains a concern for true anonymity.
RANK_REASON Product change for a messaging app, not a frontier AI release.
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