T-Mobile US Inc said on Friday hackers had accessed data of another 5.3 million wireless customers, including address, date of birth and phone numbers, widening the extent of a breach that affected millions of current, former and prospective customers.

The third-largest U.S. wireless carrier had said earlier this week that personal data of more than 40 million former and prospective customers was stolen along with data from 7.8 million existing -Mobile wireless customers.

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Data of more than 40 million exposed in T-Mobile breach