On Thursday, T-Mobile, revealed that about 15 million customers have been affected by a data breach. Hackers were able to get into the systems of T-Mobile's credit partner, Experian.

Experian runs credit checks on potential customers. According to The Washington Post, if you've applied for financing in the past two years, your information could have been stolen. Although no banking information was stolen, your personal information is likely affected. Including your name, social security number, driver's license number, address, and passport numbers.

T-Mobile chief executive John Legere said in a statement that he is "incredibly angry about this data breach" and vowed to review the company's relationship with Experian."

T-Mobile is offering two years of free credit monitoring to those who think they may have been affected.