> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/server/web-interface/administration/configuration/server-settings/security/multifactor/sms.md).

# SMS

Configure SMS multifactor authentication in Devolutions Server using a free email carrier or a Twilio subscription to deliver verification codes to users.

Multifactor authentication (MFA) via SMS requires the user to enter a code they receive on their mobile phone as its second component to access the workspace.

To enable this MFA method for your users, go to ***Administration – Server settings – Multifactor*** and check the ***SMS*** MFA option. A ***Configure*** button will appear next to the option.

{% hint style="info" %}
See [Multifactor](/server/web-interface/administration/configuration/server-settings/security/multifactor.md) for more information on MFA configuration.
{% endhint %}

There are two possible configurations available: the free version, using a carrier configured in your server's email settings, and the version configured with Twilio.

### Free version

The free version uses a carrier configured in your server's email settings. Do not fill in the Twilio settings fields. Only check the ***SMS*** box as described above, save your changes, and [configure your email settings](/server/web-interface/administration/configuration/server-settings/general/email.md).

### Configured with Twilio

To configure the SMS method with Twilio, you must have a Twilio subscription. In ***Configure***, check the ***Use Twilio instead of a carrier to send SMS*** option, then fill in the fields with your Twilio subscription information.

| Option      | Description                                  |
| ----------- | -------------------------------------------- |
| Account SID | Account SID of your Twilio account           |
| Auth token  | Authorization token from your Twilio account |
| Phone       | Phone number                                 |


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