(Bloomberg) — T-Mobile US Inc. said about 15 million consumers who filled out credit applications with the wireless carrier may have had their personal information stolen by hackers.

The breach happened when attackers gained access to a database containing T-Mobile's information that was run by Experian Plc, the credit-tracking firm, the carrier said Thursday. The hackers stole names, addresses and Social Security numbers. People who submitted credit applications from Sept. 1, 2013, to Sept. 16, 2015, were affected, T-Mobile said.

"Obviously I am incredibly angry about this data breach and we will institute a thorough review of our relationship with Experian, but right now my top concern and first focus is assisting any and all consumers affected," John Legere, T-Mobile US's chief executive officer, wrote in a letter to consumers.

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