Enabling SMS changes default authentication method

We want to be able to add SMS as a backup authentication method for our users, some still only have Symbian phones. So, in Azure AD Service Settings. We add Text message to phone as a verification option. But after re reset a test users MFA the default option goes to SMS and not authenticator app. Is there a way we can switch it around or change the default authentication method? I've looked around but cannot see an option anywhere.