LONDON - Personal details of thousands of mobile-phone customers were sold by an employee of T-Mobile to rival firms in the biggest data breach of its kind.
A T-Mobile employee sold the customer records, including details of when contracts expired, the Information Commissioner's Office (ICO) said. Rival networks and mobile phone retailers then tried to lure away T-Mobile customers by cold calling.
Information commissioner Christopher Graham said his office was preparing a prosecution.
T-Mobile said it was ‘surprised' the breach was made public.
The ICO is pushing for breaches of data protection law to be punishable with jail sentences.
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