smartphone uses touch their screens hundreds of times a day, so the screens have to be very strong. And smartphone much also be light, so you don't notice them in your pocket. Graphene is much strong and light than the material we are using at the moment to make smartphone screens. It's also much cheap.
Samsung is not the only company that is working on projects with this attractive new material. Both nokia and IBM are looking at different uses for graphene. So let the future begin