The Samsung REX series is a range of Samsung smartphones and feature phones, ranging from low to mid-end phones, running a Java-based operating system with Samsung's TouchWiz user interface. It is currently one of the Samsung line of devices that are appealing to a buyer looking to buy a budget phone alongside lower end Samsung Galaxy devices. Its main competition includes the Nokia Asha range and Firefox OS. Currently are mostly India-exclusive dual-SIM devices.
List of devices
There are currently four mobile phones in the REX range
References
Samsung REX Wikipedia(Text) CC BY-SA