What does the traffic emergency service respond to?

Just reply "traffic emergency service" via text message.

The traffic emergency service is to apply for the "traffic emergency service" for customers whose large-volume speed reduction packages have been reduced but have not reached the 200G total traffic cap. They can apply for the "traffic emergency service" through SMS and the mobile phone office, and the speed limit will be restored after activation. There is no package function fee, and you can enjoy 1G domestic general traffic (excluding Hong Kong, Macao and Taiwan), which is valid for the current month and can only be applied for once per month. After the traffic emergency service traffic is used up, the speed will be reduced again.