Responsive design doesn't work on mobile device

Site URL: http://www.muldyogaterapi.dk/

I have designed a website, and checked it with the mobile preview feature, and everything looked fine.

Now i have published the site, and the pages doesn't resize to a phonescreen...

Here is a screenshot of a phone, that doesn't resize, and a screenshot of a computerscreen with mobile preview, with nice resizing:

I have tried two different phones, with the same result.

Answered your message. You can check it!