GearVR is a headset that a mobile phone is inserted into. It requires one of the following:

• Samsung Galaxy S6
• Samsung Galaxy S6 Edge
• Samsung Galaxy S6 Edge+
• Samsung Galaxy S7
• Samsung Galaxy S7 Edge
• Samsung Galaxy S8
• Samsung Galaxy S8+

You can learn more about GearVR at the official website, http://www.samsung.com/global/galaxy/gear-vr/.