Corporate Account data usage
Who is Corporate Accounts in cellular usage in settings?
Ask your carrier about this or the IT Department at your company if they provided the phone to you.
On an iPhone, "corporate data use" refers to the practice of utilizing a dedicated, separate container on the device to store and manage work-related data, effectively isolating it from the user's personal information, ensuring that business data remains secure and cannot be accessed by personal apps or cloud services, all managed through a system called "containerization" by Apple; essentially, this allows employees to use their personal iPhones for work while keeping corporate data strictly separated.