After Apple 7plus changed its ID, the new software said that SMS verification was needed, but the verification code could not be sent. What should I do?

After changing the ID, Apple 7plus downloaded new software, saying that it needs SMS verification, but it can't send the verification code, so it can be set in the system.

ID lock is to turn on the "find my iPhone" function under iOS 7 and later systems. When the system is in the state of "find my iPhone", you need to reactivate the Apple ID account on the bound mobile phone before you can enter the desktop, otherwise the mobile phone will fall into the infinite loop of "brush-activation-brush-activation" and become the legendary "brick".

Apple introduced the ID lock function in the iOS7 system to protect Apple users. This function is triggered when Find My iPhone is turned on. Users who don't know how to use it will be locked by ID lock if they just escape from prison and brush their computers.