Jolla has announced that its Sailfish-based device will debut this year, joining the likes of Firefox OS, Ubuntu and Tizen that could rival Android in the open-platform smartphone space. Jolla, which was founded by former Nokia employees, essentially builds on the premise of the MeeGo OS which has since evolved into Tizen. Jolla’s self-titled LTE-enabled smartphone will be the first device to use Sailfish as its operating system, and comes with a 4.5-inch display, a dual-core processor, 16GB of storage expandable via microSD, an 8- megapixel camera and a replaceable battery.

The phone will cost €399 ($512) and is set to ship during the fourth quarter of this year. But what exactly is a Sailfish phone? Here are five quick facts about Sailfish and what it’s like to use Jolla’s mobile OS.

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Yolla ... Nokia neva wanted to go open sourced!