The Galaxy S6 is the sixth edition of the South Korean electronics giant's high-end, signature handset.
Along with its curved-edge variant, the Galaxy S6 Edge, the S6 will hit stores at home and in some 20 countries, including the United States, China and Australia tomorrow.
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"Given the response from the market and clients ... We expect the S6 to set a sales record for all Galaxy models," Lee Sang-Chul, the vice head of Samsung's mobile unit, told reporters.
Samsung rarely discloses handset sales figures but the Galaxy S4 - released in 2013 - is known to have set the firm's sales record of 70 million units globally.
The firm suffered a dramatic slide in profits last year, hit by slowing demand in an increasingly saturated and competitive smartphone market that it had largely dominated since 2011.
The company struggled to fend off a double challenge from Apple in the high-end market and rising Chinese firms such as Lenovo and Xiaomi in the fast-growing mid and low-end markets.
Samsung hopes the S6 will re-establish it as the clear global smartphone market leader over Apple, which has enjoyed blockbuster sales of its iPhone 6, launched last September.
Several market trackers had Apple and Samsung tied in global smartphone sales in the fourth quarter of 2014, while at least one suggested Apple had regained the throne it lost to Samsung in 2011.
Signs that Samsung was beginning to turn things around were confirmed yesterday when it released a better-than- expected profit estimate for the first quarter.
Its forecast of an operating profit of 5.9 trillion won (USD 5.4 billion) was down 30.5 per cent from a year ago, but beat average analyst expectations of around 5.5 trillion won, and was up 11.5 per cent from the previous quarter.
The S6 and the Edge - powered by Google's Android operating platform - feature metal and glass bodies in a break from their plastic-backed predecessors.
The head of the company's mobile unit J K Shin said the complex production process for the curved S6 Edge meant it might be difficult to meet initial demand.
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