T - Mobile Employee Arrested for Trying to Sell Customer Data T - Mobile Czech Republic says there was " no actual data leak " adding that " data are ( sic ) safe " . It is unclear if the company is claiming the records were for sale but remained not purchased . Attempt was detected before the customer account details were handed over The offending staffer was part of a " small team " which " worked with customer data " . There was also no word on how a single staffer , since sacked , could have had access to 1.5 million records and been able to siphon it off en masse . ;