Any competent website developer must be capable of producing sites that are compatible on mobile phones. Talented web developers use strictly responsive-design approaches to create a mobile site from the original web site that they created.
The responsive approach ile-only view. Wix, by contrast, offers a mobile-site preview and lets you make customizations that only apply to mobile viewing. For example, you may want a splash page to welcome mobile viewers, or you may want to leave out an element that doesn’t work well on the smaller screens.