The similarity to the iPhone 4 is undeniable. So is the fact that the OnePlus X is the company's best phone yet. It's available in two versions: Onyx, which has a rounded, polished black glass backplate, and Ceramic, which has a gray zirconia ceramic back that's baked at 2,700º F for over 28 hours and takes 25 days to make. Both models have brushed anodized metal frames with 17 microcuts for added texture, as well as 13 megapixel, f/2.2 rear cameras, Snapdragon 801 processors, 5-inch, 1080p AMOLED screens, and unique SIM slots that can support two nano SIMs simultaneously or one nano SIM and a microSD card. Both run OnePlus' OxygenOS, and have 16GB of internal storage.