Tens of millions of T-Mobile customers have had their details stolen in the operator’s latest data breach.

T-Mobile says it first identified malicious activity on 5 January 2023 and contained it within a day. However, the operator believes the hackers have been stealing data since 25 November 2022.

Around 37 million postpaid and prepaid customers are impacted by the breach. The hackers used an API to steal the information.

Customer data such as their name,...