"We are also discussing whether to change the number of phones in our line-up and adjust their lifecycle," Yoshida said, speaking at a news conference after the company released its results on Thursday.
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Sony has vowed to turn a profit on its flagship electronics division this year, come what may. The firm is cutting 5,000 jobs and spinning off its TV division into a separate company, a move chief executive Kazuo Hirai has said will increase accountability at the business.
In the fiscal first quarter ended June, Sony's operating profit climbed to 69.8 billion yen ($679 million) from 35.5 billion yen a year earlier. That easily beat the 16.6 billion yen average of six analysts' estimates according to Thomson Reuters Starmine.
Sony said a 14.8 billion gain from the sale of a technology centre in Japan inflated the quarterly profit, while its games and networks division - the focus of much of Sony's corporate strategy going forward - turned in a strong performance.
Still, with the smartphone business under review, Sony maintained its full-year forecasts of a 140 billion yen operating profit and a 50 billion yen net loss - which would be the company's second straight year in the red.
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"We have topped our targets (in the first quarter), but if you look at our past, we have made our targets in most first quarters but then haven't been able to meet our full-year targets," CFO Yoshida said. "I want to see how the rest of the year goes."
Separately Sony also said it would set up a joint venture with Panasonic Corp and Japan Display Inc to develop organic light-emitting diode (OLED) displays, with the government-backed Innovation Network Corp of Japan taking a majority stake