BLU Advance 4.0L Unlocked Smartphone -US GSM - Black Unlocked Dual SIM Smartphone, Android 4.4 Kit Kat 4.0" Display WVGA (480x800): 2MP Main Camera + VGA Front Camera MediaTek Dual core 1.3 GHz processor with Mali-400 GPU, 4GB internal Storage 512MB RAM with Micro SD Slot up to 64GB GSM Quad Band 3G HSPA+ (850/1700/1900): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, Straight Talk, Pure Talk USA, and others