In what ways do China Telecom, China Mobile and China Unicom usually promote value-added services such as telephone packages to customers? In addition to the sales promotion of the salesmen in the bus

In what ways do China Telecom, China Mobile and China Unicom usually promote value-added services such as telephone packages to customers? In addition to the sales promotion of the salesmen in the business hall, Hello! When Unicom launches a new business or activity, it will generally introduce it to customers through SMS group sending or telemarketing. SMS will introduce business functions, fees, opening/canceling methods, etc. You can choose whether to open it according to the way in the short message. Telemarketing means that a staff member calls you to explain the business function, cost, free experience period and opening/cancellation method on the phone. If you agree to the experience, the staff will help the customer open it.