Sales of Samsung’s new Galaxy S II smartphone in South Korea have surpassed 120,000 units in just three days, almost tripling sales of its predecessor when it launched in June 2010.

Yonhap News reports three of South Korea’s biggest mobile operators announced varying sales, with SK Telecom Co. activating 65,000 units, KT Corp. selling 40,000 units and LG Uplus Corp. announcing it sold 15,000 of the new dual-core Android smartphone.

The original Galaxy S launched on just one carrier in June 2010, debuting with SK Telecom, selling 50,000 units in its first three days on sale. With preorders estimated at 270,000 in April, sales in South Korea are only set to grow.

Samsung has partnered with 140 carriers in 120 countries, rolling out the Galaxy S II to customers starting this week. The company has already targeted at least 10 million sales of its new super-thin Android smartphone, a milestone that took the original device seven months to pass.