China Mobile provides free Beidou SMS service for Beijing users for one month.

In recent days, frequent heavy rains have occurred, in order to ensure smooth communication, China Mobile is providing Beijing users with free Beidou satellite messaging services for one month. If you have a phone that supports Beidou messaging, you can send and receive emergency messages outdoors without mobile network signal, to help you contact your family in urgent situations and confirm your safety. To use the service, please send a text message "KTBD" to 10086 in advance, and you will be able to activate the service after receiving confirmation. In emergency situations outdoors where there is no mobile network coverage, you can use this service to send Beidou messages to request help or inform others of your safety, adding an extra layer of security to your travels.