Hi friend the mobile samsung Z1 released on january 2015.the weight of this mobile is 112gms.its supoorted only dual sim. The screen size of this mobile is 4.0.1 inches and resoultion 480x800 pixels. The OS system is tizen OS v2.3 which is installed in this mobile.The internal memory in this mobile is 4GB and can be expended upto 64GB With 768MB RAM.Primary camera is 3.15MP with LED flash and it is face detected freatures.it can run when 3g is playing upto 8 hrs with LI-ION 1500mAh battreythis mobile is amazing and also have many features that a good mobile should have.Nice to buy.