
Microsoft is retiring the SMS and voice MFA it delivers itself, and I’ve already seen plenty of confusion about what actually happens and when. Message Center post MC1519855 has a few dates in it, and they’re easy to squash together. So here’s how they fit, quoted straight from Microsoft’s documentation.
The short version: Microsoft stops sending the texts and making the calls, but you can keep using SMS and voice MFA after that by bringing your own telephony provider. Nothing has to be done by 30 October or 1 November. That said, the clock is definitely ticking.
What each date means
- 30 October 2026: the third-party provider option becomes available. Nothing is turned off. The Message Center post says: “Starting October 30, 2026, Microsoft Entra ID will make Choose Your Own Telephony Provider (CYOT) generally available.” and “organizations can choose to configure a supported telephony provider.” It’s something you opt into, not a deadline. Microsoft-provided SMS and voice keep working as they do now.
- 1 February 2027: Microsoft stops providing SMS and voice for most users. Microsoft Learn says: “From February 1, 2027, Microsoft-provided telephony delivery for SMS and voice will be retired for all users except Global Administrators and external users.” Internal guest users are included in this date.
- 1 July 2027: the same retirement applies to Global Administrators and external users.
- Already happening, since 1 September 2026: users enabled for SMS or voice “are auto-enabled and nudged for Passkey registration upon MFA sign-in.” That’s why your users may already be seeing passkey prompts.
One wrinkle worth knowing. The Message Center says the provider option is generally available from 30 October, but at the time of writing the Learn page on telephony providers still describes it as a private preview. I expect the documentation to catch up, but don’t be surprised if what you read on Learn and in the admin centre don’t quite line up for a while.
What users see after their retirement date
If a user’s only MFA method is SMS or voice and the tenant hasn’t set up a provider, they’re “required to register a passkey during sign-in to continue accessing their account. This prompt is blocking.” Microsoft adds: “There is no opt out.”
Picture the Monday morning helpdesk queue at a 30-seat business where half the staff never moved off text codes. Users who already have Authenticator, a passkey, Windows Hello or another method aren’t blocked, although they may still be nudged to register a passkey. Everyone else hits a wall.
Keeping SMS and voice after February
Yes, you can. Microsoft Learn says the option “lets organizations continue using SMS or voice authentication with a supported telephony provider.” Here’s what that involves:
- Where you buy it: you choose the provider through Microsoft Security Store, and “manage their commercial relationship directly with the provider.” The provider bills you, not Microsoft.
- Which providers: “Soprano and Telesign are the initial telephony providers” in the private preview, with “more providers” by general availability. Soprano offers per-user or per-transaction pricing.
- What you need to buy it: “an Azure billing subscription and resource group, plus the appropriate Azure subscription role.” Microsoft also says to review “provider pricing and expected Azure infrastructure charges,” and links a cost calculator, so expect some Azure hosting cost on top of the provider’s fees.
- Who does what: Entra “continues to enforce your authentication method policies,” and the provider just delivers the texts and calls. You’re responsible for “reviewing its regional coverage and terms, completing the provider agreement, configuring the provider… and monitoring the service.”
- Microsoft’s own advice: use a provider “only for user populations that have a business, regulatory, or technical requirement for telephony-based authentication.”
I couldn’t find Australian pricing or confirmation of Australian coverage in what’s been published so far, so check those with the provider directly before you promise anything to a client.
What MSPs should be doing now
- Find out who uses SMS or voice in every tenant. Microsoft provides a PowerShell script for this, which needs Global Reader, Authentication Policy Administrator or Security Reader.
- Move those users to Authenticator or passkeys well before 1 February, and get Global Admins done before 1 July. Admins shouldn’t be on SMS anyway.
- Tighten the policies behind it. Once users are off text codes, make sure Conditional Access actually requires the stronger methods. I covered why that matters in Your Conditional Access Is Stuck in 2018.
- Only consider a provider for the genuine edge cases, such as shared phones, sites where phones aren’t allowed, or a regulatory requirement, and budget for the provider’s fees plus the Azure costs.
Like everything else in security, this is a shared job. Microsoft is giving us passkey defaults and a provider option. It’s up to us to get users across before the dates arrive, rather than letting a blocking prompt do it for us.
Microsoft sources
- Passkeys by default and retirement of Microsoft-provided SMS and voice authentication (Microsoft Learn)
- Choose a telephony provider for SMS and voice authentication (Microsoft Learn)
- Purchase and deploy a SaaS solution from Security Store (Microsoft Learn)
- MC1519855 in the Microsoft 365 admin centre Message Center (requires sign-in). Public copy: mc.merill.net/message/MC1519855, which is a community archive, not a Microsoft site.




