On Thursday, T-Mobile confirmed that some of its customer data was breached in an attack the company discovered on Monday. It's a snappy disclosure timeframe, and the carrier said that no financial data, passwords, or Social Security numbers were compromised in the breach. A relief, right? The problem is the customer data that was potentially exposed: name, billing zip code, email address, account number, account type, and phone number. That last one's a particular concern.

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