phone reputation

Phone reputation is a security feature in Microsoft Entra External ID that helps protect against telecom fraud during SMS-based authentication. The tag covers Microsoft's public preview of SMS self-service password reset (SSPR) for external identities, which pairs phone-based recovery with built-in fraud protections and per-message billing. Discussions focus on how phone reputation mechanisms verify the legitimacy of phone numbers used for one-time passcodes, reducing the risk of abuse in customer-facing identity scenarios. This is relevant for IT administrators managing external user authentication in Microsoft Entra.