What should I do if my brother's mobile phone is always harassed by advertising messages?

First of all, I often get this kind of text message harassment, especially when playing mahjong. I'm listening. Ding is here. Very annoying. Tell me about the solutions of several people upstairs.

1. It's no use complaining, because the other party often changes the phone number.

It is even more useless to get a new card by yourself. This kind of short message is sent in groups.

So, to sum up, who knows we are consumers? We can only put up with it and let others kill us.