Samsung Galaxy S6 SM-G920F 32GB (FACTORY UNLOCKED) 5.1" QHD - International Version (White Pearl) Display: Super AMOLED capacitive touchscreen, 16M colors - .1 inches (~70.7% screen-to-body ratio) - 1440 x 2560 pixels (~577 ppi pixel density) CPU: Quad-core 1.5 GHz Cortex-A53 & Quad-core 2.1 GHz - Exynos 7420 OS: Android OS, v5.0.2 (Lollipop) Camera Primary: 16 MP, 2988 x 5312 pixels, optical image stabilization, autofocus, LED flash - Secondary: 5 MP, 1080p@30fps, dual video call, Auto HDR Unlocked cell phones are compatible with GSM carriers such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint.