T-Mobile has announced that a hacker has stolen data from 37 million of its customers. According to Fox Business, the breach was discovered by the company on Monday and includes customers’ names, phone numbers, email addresses, account numbers, and other information.

T-Mobile CEO Mike Sievert said in a statement, “We take the security of your information very seriously and are so sorry this happened.” He added that the company has hired a leading cybersecurity firm to investigate the incident and is taking steps to enhance security.

According to KTSM 9 NEWS, the stolen data does not include passwords, financial information, or social security numbers. However, customers are advised to be wary of potential phishing attempts or other scams.

CNN reports that T-Mobile has notified all affected customers and is offering two years of free credit monitoring and identity protection services.

Yahoo Finance notes that this is not the first time T-Mobile has been the victim of a data breach. In 2018, the company suffered a similar incident in which hackers accessed the personal information of around two million customers.

T-Mobile has urged customers to take extra precautions to protect their data and accounts.