KPN mandatory SMS authentication

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KPN’s MijnKPN service provides customer access to billing, subscription management, and account settings for broadband, television, and mobile services. In 2024, KPN introduced mandatory two-step verification (2FA) to improve account security. While 2FA is a common security measure, KPN’s implementation relies exclusively on SMS messages to mobile phones, with no officially supported landline, email, or hardware token alternatives. (Security.nl )

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In early 2024, KPN began enforcing mandatory SMS-based 2FA for all customers. Users must enter a one-time code sent to their registered mobile number to access their accounts. Customers without mobile phones, non-Dutch mobile numbers, or with device issues cannot complete the authentication process, effectively restricting access.

Community reports confirm that KPN support advises users in such cases to obtain a local mobile device or contact support to regain access. The policy has been systemically applied across the customer base, demonstrating it is a corporate-wide requirement rather than isolated incidents. (KPN Community

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