Will qq send a message to the bound mobile phone after it is changed?

This will definitely be received, because if you have bound that mobile phone number before, if that mobile phone number is still in use, you will definitely receive the SMS verification code. It is difficult to replace a secret mobile phone without SMS verification code, because if you want to change the secret mobile phone number, you have to enter the verification code in the original mobile phone number to replace it. There may be another way, that is, you have verified your real name with your ID card before, so you can also change your secret mobile phone by verifying your identity information. If you choose to use the verification code to change your secret mobile phone number, it must be that the previous mobile phone will receive the verification code, and then you can only change the secret mobile phone by entering that verification code. But if you want to pass the real-name authentication, you may not need it.