How does Apple intercept overseas SMS?

For users, there are two ways to avoid such spam messages.

If people who don't use the iMessage function can turn it off directly, the short messages through the data traffic channel will not be received again;

Secondly, users can block people who have sent spam messages through settings such as "Settings-Information-Filter Unknown Senders", report to Apple and be blacklisted.

This is a flaw in the design of Apple's mobile phone system. Now the SMS of Apple's mobile phone is not transmitted by SMS, but by its own Imessage. So this kind of spam message can be said to be hard to prevent. In the past, it was not feasible for operators to intercept the keywords of spam messages. Apple never interfered with the information content sent by users, so this kind of spam messages took advantage of this loophole.