# MFA w. SMS number definition

**URL:** <https://community.auth0.com/t/mfa-w-sms-number-definition/21922>\
**Category:** Get Help\
**Tags:** mfa-sms\
**Created:** [February 28, 2019, 10:59am UTC](https://community.auth0.com/t/mfa-w-sms-number-definition/21922 "2019-02-28T10:59:38Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![arag0n](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/arag0n/32/11411_2.png) [@arag0n](https://community.auth0.com/u/arag0n)\
**Post date:** [February 28, 2019, 10:59am UTC](https://community.auth0.com/t/mfa-w-sms-number-definition/21922/1 "2019-02-28T10:59:38Z")

</div>

Is there a way to define or feed the mobile number of a user to be used in an MFA SMS scenario?

Our requirements include that the mobile number of the user is defined at account creation time and not asked to the end-user, namely, we must avoid self-service.

---

<div class="post-metadata">

**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\
**Post date:** [February 28, 2019, 12:48pm UTC](https://community.auth0.com/t/mfa-w-sms-number-definition/21922/3 "2019-02-28T12:48:09Z")

</div>

Hey there @arag0n!

Need to do a quick research on that. I’ll let you know soon about my findings!

---

<div class="post-metadata">

**Author:** ![konrad.sopala](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/konrad.sopala/32/13516_2.png) [@konrad.sopala](https://community.auth0.com/u/konrad.sopala)\
**Post date:** [March 1, 2019, 8:22am UTC](https://community.auth0.com/t/mfa-w-sms-number-definition/21922/4 "2019-03-01T08:22:30Z")

</div>

Hey there!

Unfortunately there is not a way to have it the way you wanted. That’s purely because of the fact how SMS MFA is designed:

> **[Configure SMS and Voice Notifications for MFA](https://auth0.com/docs/secure/multi-factor-authentication/multi-factor-authentication-factors/configure-sms-voice-notifications-mfa)**
>
> Describes how to configure SMS and voice notifications for MFA.

I though initially that you might be able to do this by making custom UI and asking user for the number handling authentication hitting the right authorisation api endpoints and then passing that data to MFA but it’s not doable that way.

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/auth0/original/3X/b/5/b560f266932fcce5d57f09a6595bd50518cae3f3.jpeg) [@system](https://community.auth0.com/u/system)\
**Post date:** [March 16, 2019, 8:22am UTC](https://community.auth0.com/t/mfa-w-sms-number-definition/21922/5 "2019-03-16T08:22:35Z")

</div>

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.