OTTAWA — BlackBerry’s introduction of two phones aimed at its traditional base of corporate users failed to reverse the company’s slide in the handset market, the company said in releasing its earnings on Tuesday.

BlackBerry, a Canadian smartphone maker, said it sold only 1.1 million phones in its first quarter, a decline of 500,000 from the previous quarter. The company, led by John S. Chen, also reported an adjusted loss of $28 million, or 5 cents a share, on revenue of $658 million, compared with a loss of $60 million, or 11 cents a share, on revenue of $966 million in the period last year.

From the earnings, it was unclear whether Mr. Chen’s strategy of transforming BlackBerry into a company focused on selling software was advancing as quickly as planned. On Tuesday, shares of BlackBerry fell more than 4 percent to $8.81.

Colin Gillis, an analyst with BGC Partners, said that Mr. Chen’s turnaround plan still remained unproved.