How is it that mobile phones often receive some spam messages? How to stop it?

In short, profiteers or non-profiteers want to cheat you or earn your money, so they send you short message advertisements. Generally choose a large number to send, not specifically for you, rest assured.

It's hard to stop. You can turn off the short message function, so you can't receive any short messages. If it is sent from a fixed number, you can call the operator to ask for shielding, while ordinary random numbers are difficult to prevent.