What is the 400 phone of China Mobile used for?

China Mobile 400 is a service for group customers to realize enterprise marketing promotion and customer service through voice, SMS and application. This service provides enterprises with a national unified number with a segment of 400 1 (the length is 10-digit 4001* * *), which can realize the transfer of incoming calls from this number to a preset telephone number or call center (in principle, the destination number in Liaoning is Liaoning Mobile Customer). The communication cost of this service is shared by the calling party and the called party. The calling party bears the local call fee or roaming call fee, and the enterprise pays the local or long-distance communication fee according to the actual calling location and incoming call duration of the calling customer.