website not found

I have been getting the error message “website not found” when trying to open the site on mobile devices. I have initially tried using WP Touch and had no luck (did activate and deactivate). When searching on the phone using https://www.centeurimports.com it changes to mobile.centeurimports.com. This results in the site not being found- what do I need to do so that the mobile site is the same or has the same pages?