Credit reporting agency Experian says that hackers accessed the social security numbers, birthdates and other personal information belonging to about 15 million T-Mobile wireless customers.
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T-Mobile uses Experian to check the credit of its customers.
Experian said Thursday T-Mobile customers who applied for wireless service between Sept. 1, 2013 and Sept. 16, 2015 may have had their information stolen.
Experian says it immediately notified law enforcement authorities after discovering the hack.
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