Kazuo Hirai, the head of Sony, says Xperia Z’s sales lifted Sony’s struggling electronics sector.

TOKYO Sony’s Xperia Z smartphone, which went on sale in February, has already sold almost a million units by some estimates. But NTT DoCoMo, Japan’s largest mobile carrier, will soon stop selling it.

The Xperia Z has not even hit the United States market yet: T-Mobile says the model will make its debut on its network in the coming weeks.

But it is already a has-been in Japan. DoCoMo has turned its attention to a new phone, the Sony Xperia A a model with fewer features that has not won the stellar praise showered on the Z.

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