BLU STUDIO X MINI 4G LTE GSM Unlocked Smartphone with Android 5.1 Lollipop OS - Black Unlocked Dual SIM smartphone, with Android 5.1 Lollipop Bright 4.5'' Display, Dual SIM (Micro-SIM, dual stand-by) 5MP Main Camera: autofocus, LED flash + VGA Front Camera: geo-tagging, touch focus, face detection MediaTek Quad Core 1.0 GHz Processor with Mali-T720 GPU, 8GB Internal memory 1GB RAM Micro SD up to 64GB GSM Quad Band, 4G LTE (B2/3/7/28): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk, Pure Talk USA and others