The market in the two versions of the Galaxy S8 is crucial for the company's image, after the Note 7s had to be withdrawn, which subtracted 5.48 billion dollars.

Samsung unveiled its Galaxy S8 mobile reference phone while struggling to regain the leadership it lost to Apple Inc. after the shameful withdrawal of its failed Note 7s device. 

With one of the biggest curved screens ever made, the expected S8 is the first premium handset of the South Korean tech giant since the October 7 debacle, which stripped it of 5.48 billion dollars in profits and helped Apple surpass Samsung as The world's top mobile phone maker in the fourth quarter. 

Two versions of the Galaxy S8 - internally known as Dream Code - were unveiled Wednesday at a media event in New York with curved screens of 15.75 and 14.73 centimeters,

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The devices, which go on sale April 21, are somewhat larger, but comparable in width with their predecessors, as Samsung removed almost all frames around the screen to maximize the surface area. 

The S8 includes Samsung's new artificial intelligence service, Bixby, which runs on a voice assistant system similar to Apple's Siri. There is also a new facial recognition application, which allows users to unlock devices just by looking at them.

• Galaxy S8 - 148.9 x 68.1 x 8.0 mm ( 5.86 x 2.68 x 0.31-inch), 155g (5.36oz) 
• Galaxy S8 Plus - 159.5 x 73.4 x 8.1 mm (6.00 x 3.09 x 0.31-inch), 173g (oz)

Samsung hopes that the design update and new tools - none revolutionary but focused on making life easier for consumers - will be enough to revive sales in a year that Apple could introduce significant changes in Their iPhones on the occasion of their tenth anniversary, including curved screens that have become a Galaxy emblem. 

The S8 is also crucial for Samsung's image as a reliable manufacturer of mobile devices. The Galaxy Note 7s, affected by auto combustion cases, had to be withdrawn in October, just two months after its launch. 

The firm responded by implementing new safety measures in its batteries.