What business is Unicom I hanging empty?

If you are talking about Unicom's on-hook SMS service, Unicom's on-hook SMS service is a mobile phone service customized by the called party and displayed by the calling party. After the fixed and mobile users handle it, the calling mobile phone users will receive preset short messages by dialing their numbers. The content of SMS can be advertising slogan, enterprise information, business introduction, product introduction, preferential promotion activities, holiday wishes and other information, which can be edited and modified at any time.