Nokia, the world’s largest mobile phone maker, reported a $1.36 billion loss in the third quarter as the company wrote down the value of its wireless networks venture by $1.35 billion and global sales declined 20 percent.

The company said that its leading share of the global cellphone market remained unchanged at 38 percent. But it acknowledged that its lead in smartphones, the fastest-growing segment of the market, had fallen to 35 percent from 41 percent, losing ground to Apple’s iPhone and Research in Motion’s BlackBerry devices.

Nokia estimated its market share of the global smartphone segment fell to 35 percent from 41 percent in the second quarter.

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