It also comes with vice-chairman Lee Jae-Yong and other executives on trial for bribery over their alleged role in the graft scandal that brought down former president Park Geun- Hye.
But the company's profits are rising and the new phones have received good reviews, with more than one million pre- orders for the S8 and the larger S8+ in South Korea alone.
Shares in Samsung Electronics jumped more than 2.5 per cent today, adding around $7 billion to its market capitalisation.
"Market reactions to the release of the S8 series are somewhat positive," said Lee Seung-Woo of IBK Investment Securities.
Samsung could break the record 48.5 million unit sales it achieved with its S7 series, he added.
"Barring the weakening of the US dollar, Samsung's second-quarter operating profit would reach 12 trillion won," Lee said.
Pre-order deliveries began earlier this week, and in- store sales begin in the US and Canada later Friday, with the device due to be rolled out to around 50 more countries next week.
Samsung Electronics is the flagship subsidiary of the giant Samsung Group, whose revenues are equivalent to a fifth of South Korea's gross domestic product, and the S8 series introduction comes at a delicate time for the embattled firm.
The Note 7 recall debacle cost it billions of dollars in lost profit and hammered its global reputation and credibility, forcing it to apologise to customers and postpone the S8 launch.
"The latest salvo from Samsung shows how it's keen to regain consumer confidence and attain leadership in the smartphone landscape, a nearly saturated but still highly competitive space that remains key to retaining subscriber loyalties and winning new converts," IHS Markit said.
When Samsung unveiled Galaxy S8 and S8+ in New York last month, it said the new handsets would mark a "new era of smartphone design".
Fitted with screens of 5.8 and 6.2 inches, the two handsets include Samsung's upgraded digital assistant Bixby, competing in a crowded field that includes Apple's Siri, Google Assistant and Amazon Alexa.
The most striking feature of the new phones is what Samsung dubs an "infinity display" -- an expanded glass screen that covers the entire front of the device and appears to curve seamlessly around its edges.
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