I received many verification code messages from various websites for two consecutive days. What happened?

I received many verification code messages from various websites for two consecutive days, which are divided into the following two situations:

First, operators should bomb by SMS. The basic way of working is to submit your mobile phone number to the website through a zombie program, so as to realize SMS bombing. It is possible. He just wants to bomb you.

Second, cover up some information through SMS bombing. It is possible that the operator tried to attack your account through SMS verification code access. Maybe I don't understand. Give a chestnut "SMS monitoring Troy". By monitoring short messages, you can get the verification code sent to you by the platform, thus invading your account.

However, there may be software design defects, and this message will not be deleted. You know that when an unknown verification code message is sent, you may check this account and retrieve it, so that hackers can't "hold" your account for a long time.

This is what hackers don't want to see. Therefore, they usually send a large number of registration verification codes of other platforms to cover up the verification code messages that you don't want to see in the end.