How does Apple 5s intercept spam messages?

Apple 5s intercepts spam messages as follows:

Apple's mobile phone with iOS system can be set to block short messages with the help of mobile phone. The operation mode is also very simple: open the settings, find the information, drop down to find the function of filtering unknown senders, and open it.

One-click filtering of mobile phone housekeeper can directly open spam filtering in mobile phone housekeeper, and can also filter spam more efficiently, and blacklist "unsubscribe", "unsubscribe", "reply to T" and "reply to T" as keywords.

When receiving spam messages, the so-called "unsubscribe back to T" is useless. After you reply "T", you will only receive more spam messages. You can try to reply to the "0000" blocked SMS port, and some need to reply to a 0. After that, all notification messages will be blocked directly from the operator's port.