Samsung Electronics has forecast an operating profit of 6.7tn won ($5.9bn; £3.8bn) for the period, its highest quarterly profit since 2008.
Its fortunes contrast with its Taiwanese rival HTC, which has reported a 58% fall in three-month profits.Taiwanese smartphone maker HTC has reported a 58% fall in net profit to 7.4bn Taiwanese dollars (US$248m) in the three months ending in June.
Disappointing European sales and problems with US customs were blamed.
Samsung overtook Nokia as the world’s biggest maker of mobile phones earlier this year.
Analysts said its profits could rise even further in the coming months.
“Earnings will be stronger in the current quarter, as sales of the high-end Galaxy S III will increase dramatically and drive the telecom division’s earnings to above 5tn won,” said Nho Geun-Chang, an analyst with HMC Investment Securities.
“We estimate shipments of the Galaxy S III will reach 19 million units in the third quarter.”