T-Mobile says data on 37 million customers stolen

BOSTON (AP) — The US wireless carrier T-Mobile said Thursday that an unidentified malicious intruder breached its network in late November and stole data on 37 million customers, including addresses, phone numbers and dates of birth.

T-Mobile said in a filing with the US Securities and Exchange Commission that the breach was discovered January 5.

It said the data exposed to theft — based on its investigation to date — did not include passwords or PINs, bank account or credit card information, Social Security numbers or other government IDs.

“Our investigation is still ongoing, but the malicious activity appears to be fully contained at this time,” T-Mobile said, with no evidence the intruder was able to breach the company's network. It said the data was first accessed on or around November 25.

T-Mobile said it has notified law enforcement and federal agencies, which it did not name. It did not immediately respond to an e-mail seeking comment.

The company has been hacked multiple times in recent years. In its filing, T-Mobile said it did not expect the latest breach to have material impact on its operations.

But a senior analyst for Moody's Investors Service, Neil Mack, said in a statement that the breach raises questions about management's cyber governance and could alienate customers and attract scrutiny by the Federal Communications Commission and other regulators.

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