On the problem of mass sending of mobile phone short messages

You should be an enterprise, right? Generally, operators like Mobile in all provinces and cities now have a server called SMS, such as mobile MAS 1.0, MAS2.0, etc. They usually install it for enterprises free of charge, and then charge you information fees. You can consult your local operator, such as Mobile. I do this in Ningxia Mobile. If you want to know more, you can ask me.