-The following table provides a list of the features that are available in the various versions of Azure AD Multi-Factor Authentication. Plan out your needs for securing user authentication, then determine which approach meets those requirements. For example, although Azure AD Free provides security defaults that provide Azure AD Multi-Factor Authentication, only the mobile authenticator app can be used for the authentication prompt, not a phone call or SMS. This approach may be a limitation if you can't ensure the mobile authentication app is installed on a user's personal device. See [Azure AD Free tier](#azure-ad-free-tier) later in this topic for more details.
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