Samsung Electronics Co. opened with a tumble Monday in Seoul, falling as much as 5.5 percent. The company, along with U.S. regulators, asked users to turn off their Note 7 smartphones because of fire risk. The Suwon, South Korea-based company has already announced a voluntary, worldwide recall of all 2.5 million of the phones it has already shipped, at a cost to Samsung estimated at as much as $1 billion.
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