UPDATE: If you’d prefer to not use the Protect My ID credit monitoring service, which is a part of Experian, John Legere says that there will be another option “by tomorrow.”

One of the big features of T-Mobile are its installment plans and JUMP! On Demand program, which let you pay as little as $0 down for a new device. Unfortunately, one of the credit services that T-Mo uses to process check applications for those programs has had a data breach.

Experian says that on September 15, an unauthorized party accessed T-Mobile data that was stored in one of its servers. During this incident, records that hold names, address, Social Security numbers, dates of birth, ID numbers — like those on a driver’s license or passport — and other info used in T-Mobile’s credit assessment was accessed. It’s said that the records of approximately 15 million people were accessed. The info stored in this server was gathered between September 1, 2013, and September 16, 2015. Experian does say that no bank or credit information was accessed in the breach.

Right now both Experian and T-Mobile are investigating the situation and taking steps to protect the affected consumers. If you think that you may have data that was accessed, you can sign up for two years of free credit monitoring and identity resolution services right here.

Experian says that it’s taken “aggressive steps” to improve the protection of their system and T-Mobile user data. However, John Legere does say that T-Mo will conduct a “thorough review” of its relationship with Experian.

Again, if you had your credit check by T-Mobile between September 1, 2013, and September 16, 2015, you may be affected by this breach. Hit this link to sign up for two years of credit monitoring and identity resolution services.

Thanks, Austin!

Sources: T-Mobile, Experian