It was released in India in January 2015, Bangladesh in February 2015 and Sri Lanka in May 2015.
The Samsung Z1 features a 480×800 WVGA PLS TFT 4-inch display with a pixel density of 233 pixels-per-inch.
It has a 1.2 GHz dual-core ARM Cortex-A7 processor, 768 MB RAM, 4 GB of storage (with option for up to 64 GB of additional storage via microSDXC card) and a 1500 mAh battery.
The UI was specifically designed for users who were upgrading from feature phones to smartphones.
By June 2015 Samsung sold 1 million units.