Android phones often receive information about software promotion, probably attached to some software or games (I don't know which software). How can I stop him from sending it?

It's the virus-infected software that you downloaded before. I've seen this before. If you want to solve it completely, you can do this: first, back up the important information in your memory card and mobile phone (delete all software), format the memory card, and restore the factory settings of the mobile phone. At present, Android mobile phone virus is rampant. If there are only some recommended advertisements, there are still many softwares that hide the charges and traffic. It is heartless to automatically delete the SMS notification of the charges and traffic. Please pay attention!