Is the 400 call free?

No, 400 calls are charged. Telecom operators provide different types of services for 400 telephone users, which usually include extra fees, such as communication fees, equipment and bandwidth. However, some telecom operators may provide free 400 telephone service, which usually includes extra fees, such as free telephone numbers. Therefore, if you have any questions about the 400 phone bill, please consult the telecom operator for more information.