An anonymous reader writes: It’s no secret that Mozilla has been working on a mobile OS. Previously codenmed Boot2Gecko, the project focused on a purely HTML5 based system that worked in many ways like current mobile devices. As the project grew into Mozilla OS, the company has laid out a partnership with ZTE that will have real world devices in certain markets early next year. Testing for this OS had previously consisted of a compiled ROM that would be flashed over a handful of Android devices. Now, Mozilla has moved into full fledged product evaluation mode with their own custom developer phone.