BLU D510a-BLK Studio 5.3 Unlocked GSM Phone with Dual SIM Card Support - 5MP Camera - MicroSD Slot Expandable Up To 32GB - US Warranty - Black This unlocked cell phone will work on GSM carries like AT&T and T-Mobile. Not all carrier features may be supported. GSM 850/900/1800/1900: SIM 1 and SIM 2: HSDPA 850/1900/2100 SIM 1 Android OS, v2.3 (Gingerbread); 512 MB ROM, 512 MB RAM; 650 MHz ARM1176 CPU; microSD card slot; Wi-Fi 802.11 b/g, Wi-Fi hotspot; Bluetooth v2.1 with A2DP 5 MP, 2592 x 1944 pixels, autofocus, LED flash; Video: 480p@30fps. Secondary VGA camera