Short answer
Microsoft Entra ID stops sending SMS and voice sign-in codes itself on 1 February 2027 for most users. Global Administrators and external users follow on 1 July 2027.
In detail: Entra ID SMS and Voice Sign-in Retirement Dates
The key dates:
- From 1 September 2026: Microsoft starts turning on passkeys by default, and users enabled for SMS or voice are nudged to register one
- 1 February 2027: Microsoft-provided SMS and voice ends for most users
- 1 July 2027: the same for Global Administrators (while the role is active) and external users
Microsoft's dates apply to the public cloud and may change, so check the Microsoft sources linked on the FirstNet Entra SMS sign-in page. To keep SMS sign-in working, your business needs a telephony provider set up before its date. Contact us for an Entra SMS readiness check.