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The phone number requirement establishes the primary identification and verification mechanism for account access, and the authorization to send verification communications via SMS and voice calls defines the operational channels through which Signal delivers authentication credentials.
Users must provide a phone number as a condition of service registration and must consent to receive automated verification messages and calls at that number. This requirement determines both the account creation process and the communication methods Signal uses to establish account access.
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"To create an account you must register for our Services using your phone number. You agree to receive text messages and phone calls (from us or our third-party providers) with verification codes to register for our Services.— Excerpt from Signal's Signal Privacy Policy
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The phone number requirement establishes the primary identification and verification mechanism for account access, and the authorization to send verification communications via SMS and voice calls defines the operational channels through which Signal delivers authentication credentials.
Users must provide a phone number as a condition of service registration and must consent to receive automated verification messages and calls at that number. This requirement determines both the account creation process and the communication methods Signal uses to establish account access.
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