HTC Desire 816w 5.5 inch Android 4.4 MSM8228 Quad Core 1.6GHz 13.0 MP Dual Sim Unlocked 3G HSPA Smartphone Color Grey Dual Sim Card Nano Sim Card 2G: GSM 850/900/1800/1900MHz; 3G:WCDMA/HSPA 900/1900/2100MHz Memory Card slot microSD, up to 128 GB Internal 8 GB, 1.5GB RAM FEATURES OS Android OS, v4.4 Quad-core 1.6 GHz ,Messaging SMS, MMS, Email, Push Email Browser HTML5 Double Camera, Front Camera 5.0MP, Back Camera 13.0MP, Support 1080p video Multi-language, Google Play, Bluetooth 4.0 Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.