T-Mobile this week acknowledged that millions of records from thousands of its wireless customers in England were sold by employees to third-party contractors who then called customers as their wireless plans were about to expire.

T-Mobile officials notified England's Information Commission of the out and out violation of customer privacy rights, saying that the activity was done "without our knowledge," according to a BBC report.

Information Commissioner Christopher Graham, representing the consumer privacy group, said it will prosecute those responsible for trading customer records and seek prison sentences for what he called the largest data breach of its kind.

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