Samsung Galaxy S6 SM-G920A 64GB Gold Smartphone for AT&T (Certified Refurbished) 5.1-inch touchscreen display with a resolution of 1440 pixels by 2560 pixels at a PPI of 577 pixels per inch. 1.5GHz octa-core Samsung Exynos 7420 processor 16-megapixel primary camera on the rear and a 5.0-megapixel front shooter for selfies. 64GB of internal storage cannot be expanded.