Just trying to get iphone.domainnaam.ext working.

First i enabled it in the MJ Admin, received a 404 error.

Second i created a subdomain in the Control Panel, got a placeholder now.

How to show the MJ theme on a subdomain?

I understand the feature is to point (in this case an iPhone) to a iphone website on a subdomain.
I would be nice to show the MJ theme under iphone.domain.ext...

so you created the iphone subdomain with your web host?

I have the same issue. Next step: delete the standard .html file which is placed by the hosting provider.
Next issue: 404 error (forbidden, you don't have permission to access / on this server. Additionally a 404 not found error was encountered while trying to use an ErrorDocument to handle the request.

How to solve?

Thanks,

Roy