How should organisations replace SMS OTP without creating user friction?

Move high-risk access to phishing-resistant MFA, then keep one accessible alternative that does not depend on an interceptable delivery channel. Use FIDO-based methods for primary journeys, add device trust where context matters, and reserve weaker factors only for tightly controlled fallback paths. The goal is not more prompts. It is less exploitable authentication.

Why This Matters for Security Teams

SMS OTP remains attractive because it is familiar, widely supported, and easy to deploy, but it is also tied to an interceptable delivery channel. That creates avoidable exposure to SIM swap, SS7 abuse, phone porting fraud, and real-time phishing proxies. The real issue is not just whether an attacker can read a code, but whether the factor can be replayed, relayed, or socially engineered at scale.

For organisations replacing SMS without adding friction, the design problem is to preserve accessibility while raising assurance. Phishing-resistant MFA, especially FIDO-based authentication, shifts the trust anchor away from a code that can be copied and toward a cryptographic proof that is far harder to intercept. That aligns with the direction of the NIST Cybersecurity Framework 2.0, which pushes mature identity controls toward stronger, risk-based protection.

For NHI Management Group, this is the same lesson seen across identity programs: weak but convenient factors survive until an incident forces change. In practice, many security teams encounter the cost of SMS OTP only after account takeover has already become a support and fraud problem, rather than through intentional authentication design.

How It Works in Practice

The practical replacement pattern is to make the default sign-in path phishing-resistant, then keep one accessible fallback that is harder to abuse than SMS. For most user journeys, that means FIDO2 security keys or platform authenticators, combined with device trust and risk signals when the application context warrants it. The objective is not more challenges, but fewer dangerous ones.

Good implementations separate primary authentication from recovery. A user who can prove possession of a registered device or hardware key should not be routed back to an SMS code for routine access. Instead, recovery should be governed by higher-assurance steps such as verified help desk workflows, backup codes, or pre-enrolled alternate authenticators. Where risk is low, current guidance suggests keeping the path simple; where sensitivity is high, step-up authentication should be triggered by context, not by a universal rule.

• Use phishing-resistant MFA for primary login journeys, especially for administrators and high-value accounts.
• Prefer platform authenticators or hardware keys over one-time codes sent through a mobile carrier.
• Use device posture, session risk, and location context to decide when step-up is necessary.
• Keep fallback authentication separate from account recovery so a lost device does not reopen the SMS problem.
• Measure abandonment and help desk contacts during rollout, then tune flows before broad enforcement.

This approach fits cleanly with zero trust and identity-centered control design, and it maps to the kind of governance NHI Mgmt Group describes in its Ultimate Guide to Non-Human Identities, where credential strength, rotation, and lifecycle control matter as much as access intent. The same operational discipline appears in the Schneider Electric credentials breach, which shows how exposed credentials can become a broad access problem once they are no longer tightly controlled. These controls tend to break down when organisations leave SMS as the default recovery path because support desks then become the weakest authentication layer.

Common Variations and Edge Cases

Tighter authentication often increases rollout cost and support burden, so organisations must balance stronger assurance against user accessibility, device diversity, and recovery complexity. That tradeoff is real, especially in frontline, contractor, and shared-device environments where not every user can carry a managed phone or hardware token.

Best practice is evolving for these edge cases. Some organisations use a mix of platform authenticators, roaming security keys, and carefully controlled backup codes. Others add verified account recovery through HR- or identity-proofed workflows. There is no universal standard for this yet, but the direction is consistent: avoid any factor that can be intercepted through telecom infrastructure or easily replayed through social engineering.

A second edge case is accessibility. Users with disabilities, travelers, or employees in poor-connectivity regions may need non-SMS alternatives that still meet assurance goals. In those environments, security leaders should test flows with real users, not just policy owners. The strongest outcome is a layered design that lets most users move faster while giving high-risk accounts a much higher bar. That is also why NHI Mgmt Group’s broader guidance on identity risk matters: modern identity programs fail when convenience is treated as a control, not when controls are engineered for actual use.

Related resources from NHI Mgmt Group

• How should security teams implement context-aware authentication without creating too much user friction?
• How should organisations move away from password-based authentication without hurting user productivity?
• How should banks replace SMS OTP for high-risk transactions?
• How should security teams replace traditional MFA without creating new access friction?