BLU Studio G - Unlocked - Black 5.0" IPS Display (480x854): 5MP Autofocus Main Camera + VGA Front Camera Unlocked Dual Sim Phone, Android 4.4 Kit Kat upgradeable to Android 5.0 Lollipop MediaTek Quad Core1.3GHz Processor with MALI 400 GPU, 4GB Internal Storage 512MB RAM with Micro SD Slot up to 64GB GSM Quad Band 4G HSPA+ (850/1700/1900): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk, Pure Talk USA and others