T-Mobile just told some customers that there was a data breach of their personal information. Here’s how to check if you’re affected.

• T-Mobile recently suffered a data breach where hackers gained access to some users’ personal information, the company confirmed Friday.
• Stolen data included users’ names, addresses, phone numbers, and plan details. No financial information or social security numbers were compromised.
• The company did not clarify the extent of the breach or when it happened.
• Visit Business Insider’s homepage for more stories.

T-Mobile suffered a data breach earlier this month in which hackers accessed people’s personal information, the company confirmed Friday.

A malicious third party gained access to users’ account information, including names, addresses, phone numbers, account numbers, and the type of cell phone plan they’re on, according to T-Mobile’s announcement.

Financial information like credit card numbers were not compromised, and neither were social security number, the company said.

A T-Mobile spokesperson told Business Insider that the breach affected T-Mobile prepaid accounts, and less than 1.5% of T-Mobile customers were impacted.

Am I affected by the T-Mobile data breach?

Only T-Mobile customers were affected, so if you use a different carrier, you're safe.

FCC rules require that T-Mobile notify people who were affected by the breach, and T-Mobile said it will notify all affected users "shortly." However, just because you didn't receive a notification doesn't mean you're safe - T-Mobile notes that it may not have notified you if it doesn't have your up-to-date contact information.

If you're unsure whether you were affected, you can call 1-800-T-MOBILE to reach customer service.