The Galaxy S4 Mini, which follows the debut of the S4 just a month ago, will have a 4.3-inch SuperAMOLED screen -- still bigger than Apple's 4-inch iPhone 5 -- and an 8MP rear-facing camera. This phone runs on a 1.7GHz dual-core processor, paired with 1.5GB RAM, and offers 8GB internal storage, along with microSD support up to 32GB.
By comparison, the original S4, which hit the 10 million-sale mark last week to become Samsung's fastest selling smartphone, has a bigger 5-inch full high-definition screen and a 13MP camera.
Samsung did not announce a price for the phone or give a launch date, but the market estimates the smaller type will be priced at around $350.
The launch comes ahead of the widely speculated low-priced iPhone later this year and as Samsung, the world's top smartphone maker, looks to widen its lead with products spanning both the high and cheap-and-cheerful ends of the market.
Samsung is also expected to unveil more varieties of the S4 in the upcoming mobile event in London next month including a model with optical camera zoom functionality as well as a phone with water-proof features.