Yes. You agree to defend, indemnify, and hold us and our directors, officers, and employees harmless from any claims arising out of use of the Services, Products, or Devices, breach of the Agreement, or violation of any laws or regulations, or the rights of any third party by you, any person on your account, and any person you allow to use the Services, Products, or Devices.
Basically, you agree to pay for whatever harms T-Mobile incurs if you, someone on your account, or any person you allow to use T-Mobile's services, is responsible for those harms as a result of using T-Mobile's services.