Merge pull request #111247 from iainfoulds/azuread-auth-smssignin-crosslink

[AzureAD] Cross link with end-user SMS sign-in article

Author: PRMerger12

articles/active-directory/authentication/howto-authentication-sms-signin.md

@@ -88,7 +88,7 @@ Each user that's enabled in the text message authentication method policy must b
 
 ## Set a phone number for user accounts
 
-Users are now enabled for SMS-based authentication, but their phone number must be associated with the user profile in Azure AD before they can sign in. The user can set this phone number themselves in *My Profile*, or you can assign the phone number using the Azure portal. Phone numbers can be set by *global admins*, *authentication admins*, or *privileged authentication admins*.
+Users are now enabled for SMS-based authentication, but their phone number must be associated with the user profile in Azure AD before they can sign in. The user can [set this phone number themselves](../user-help/sms-sign-in-explainer.md) in *My Profile*, or you can assign the phone number using the Azure portal. Phone numbers can be set by *global admins*, *authentication admins*, or *privileged authentication admins*.
 
 When a phone number is set for SMS-sign, it's also then available for use with [Azure Multi-Factor Authentication][tutorial-azure-mfa] and [self-service password reset][tutorial-sspr].
 
@@ -131,6 +131,8 @@ If a user has already registered for Azure Multi-Factor Authentication and / or
 
 A user that has a phone number already set for their account is displayed a button to *Enable for SMS sign-in* in their **My Profile** page. Select this button, and the account is enabled for use with SMS-based sign-in and the previous Azure Multi-Factor Authentication or SSPR registration.
 
+For more information on the end-user experience, see [SMS sign-in user experience for phone number (preview)](../user-help/sms-sign-in-explainer.md).
+
 ### Error when trying to set a phone number on a user's account
 
 If you receive an error when you try to set a phone number for a user account in the Azure portal, review the following troubleshooting steps: