SAN FRANCISCO (KPIX 5) — Samsung’s smartphone problem is getting even hotter.

A man is suing the company after he says his Galaxy Note 7 exploded in his pocket.

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This appears to be the first lawsuit in the U.S. over the battery defect linked to fires.

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Samsung announced weeks ago it was recalling 2.5 million cellphones.

This week the federal government issued a formal recall.

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U.S. safety regulators first warned owners not to use the Galaxy Note 7 on airplanes. Now they are saying not to turn them on at all.