STOCKHOLM--Revenue of Nokia Corp.'s network arm continued to slip in the first quarter, underscoring the challenges facing the company's new chief executive to get the business growing.

In its earnings release on Tuesday Nokia said revenue fell 15% to 2.66 billion euros on the year in the three months ending March 31. The sales decline was largely a result of a 17% sales drop for Nokia's mobile network operations, which accounts for almost 90% of the company's revenue, now that the handset business has been transferred to Microsoft Corp.

Nokia earlier on Tuesday named mobile-network veteran Rajeev Suri its new chief executive and said it would use a significant amount of the cash from the recent sale of its handset business to distribute more than 3 billion euros to investors.

Some of the network business' revenue decline could be attributed to restructuring efforts, as the mobile network unit has divested parts of its business, such as optical networks, to focus solely on mobile-broadband equipment. Lower sales of services also contributed to the decline, Nokia said.

The network business, however, improved its profitability as a result of a better sales mix, with a larger share of high-margin software sales. Nokia's network business had a 39.6% gross margin in the first quarter, up from 34% a year ago.

On a whole, Nokia posted a 239 million euro net loss in the first quarter, narrowing slightly from a 272 million euro loss a year ago. The losses came on the back of yet another dismal quarter for Nokia's handset unit, which last week was transferred to Microsoft.

The handset unit, now accounted for as part of Nokia's discontinued operations, saw a 30% yearly sales drop to 1.92 billion euros in the first quarter, Nokia said, while its operating loss widened to 326 million euros, from a 73 million euro loss a year ago.

Nokia cited competitive industry dynamics, both for its basic mobile phones business and the smartphone operations, as the reason for the sales drop. Without providing details, Nokia said it saw lower average selling prices for both mobile phones and smartphones in the quarter. Smartphone volumes were higher on the year, while unit sales of basic mobile phones fell, Nokia said.

Excluding the performance of the handset unit, Nokia would have posted a 108 million euro profit in the first quarter, up from a 98 million euro loss a year ago.

Write to Sven Grundberg at sven.grundberg@wsj.com

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