Joke Collection Website - Public benefit messages - What does it mean to deduct 0.30 yuan from the uplink fee for group SMS?

What does it mean to deduct 0.30 yuan from the uplink fee for group SMS?

The cost of sending text messages. Deducting 0.30 yuan for the uplink fee of mass SMS refers to the cost of sending SMS to a service number. Short messages contain uplink and downlink costs. Uplink cost refers to the cost that users send short messages to a service number, and downlink cost refers to the cost that users receive short messages from a service number.