BLU Z3 - Dual Sim Phone - GSM unlocked -Black/Blue Unlocked Dual Sim Smartphone, Android v4.4 KitKat VGA Camera with LED flash FM Radio,MP3 Player, MP4 Player and Bluetooth 32MB memory 24MB RAM Micro SD up to 32 GB GSM Quad band 2G (850/900/1800/1900): compatibility Nationwide on T-Mobile, Straight Talk, Simple Mobile, or any other carrier that accepts a 2G GSM Sim Card. Will NOT work with 3G only providers like ATT nor any CDMA Carriers (Verizon, Sprint, Boost, PagePlus)