How to clear the system cache on the Galaxy J3: Turn the Galaxy J3 off. Press and hold the Volume Up, Power and Home buttons at the same time until the Android logo shows up and the phone vibrates. Then let go of the Power button and continue to hold the other buttons. Use the volume buttons to scroll down to highlight Wipe Cache Partition. Samsung Galaxy J3 (2016) - Support Overview. Find all Galaxy J3 (2016) Support information here. Learn how to activate, set up features and troubleshoot issues with our FAQs, how-to guides and videos. 12.7 centimeters (5-inch) super AMOLED HD multi-touch capacitive touchscreen with 1280 x 720 pixels resolution 16M color support. Memory, Storage and SIM: 2GB RAM | 16GB internal memory expandable up to 128GB | Dual SIM (micro+micro) dual-standby (4G+4G) Android Lollipop v5.1 operating system with 1.5GHz Spreadtrum quad core processor. dIhBq4.