Cardboard works with almost any smartphone on both iOS and Android. See the full list of Daydream devices on the Google VR) website. Daydream consists of Daydream-ready phones, headsets, controllers and experiences and supports high-end Android mobile devices through Daydream. Google VR technologies includes Daydream, a platform for high quality mobile VR and Cardboard, built for bite-size VR experiences and 360 video. Google VR provides an SDK for Unity that allows you to build VR content for this rich ecosystem of devices.
Google VR encompasses support for smartphones, head mounted viewers and controllers, standalone head mounted displays and applications.
Google VR is the technology behind both Google Daydream and Google Cardboard VR platforms.