US telecommunications provider T-Mobile disclosed a cyberattack resulted in a data leak. This incident is the fourth data breach in the past three years.

"Our Cybersecurity team recently discovered and shut down malicious, unauthorized access to some information related to your T-Mobile account," the company said in emails sent to its customers.

Unknown malicious actors have accessed customers’ phone numbers, the number of lines subscribed to an account, and, in some cases, call-related information. T-Mobile collects this kind of information as part of the normal operation of its wireless service.

Hackers haven’t accessed names on the account, physical or email addresses, financial data, credit card information, social security numbers, tax ID, passwords, or PINs. The incident only impacted 0.2% - around 200,000 customers - of the T-Mobile’s total userbase.

Previous data breaches in T-Mobile occurred in August 2018, when hackers accessed the personal details of 2 million of users, in November 2019, and March 2020. The latest incident is smaller then previous three.