In May, T-Mobile disclosed that 836 customers were affected in a security breach. The carrier said its systems had detected that a bad actor had accessed limited information from a small number of T-Mobile accounts. While account PINs were compromised, T-Mobile said account information and call records were not affected. The company reset account PINs and offered free credit monitoring and identity theft detection via Transunion myTrueIdentity for the next two years.