those spammers actually signed up with the unlimited sms plan with any telco, can be maxis, digi or celcom.

then they will use an app to blast the spam sms to thousands of phone numbers.

when telco noticed that this spammer already exceeding the daily limit for the'unlimited sms', telco will block the spammers numbers. that is why we will never get the spam sms from the same numbers.

the spammers will register a new number then..

how to control this?? I think telco already do their best to block these spammers immediately when they detected the high volume of sms sent out to people like us..