Qq can open the device without SMS verification and will not change the number bound to the device. How do I log in?

The mobile version of QQ4.6.2 has added a mobile phone locking function. You can see a device locking option in the lower part of the settings. If you need to log in to this QQ number for the first time on other iphone and Android phones after the device is locked and turned on, you need to use a secure SMS to verify it. When logging in to this QQ for the first time on the computer, you need to scan the QR code of the mobile phone version for verification. However, QQ mobile phone device lock only supports Android, iPhone, wp8 and PC versions of QQ. If you want to log in on other devices, you need to turn off the device lock before you can log in normally. Moreover, to unlock the device, it is necessary to bind the confidential mobile phone number, and the bound mobile phone number must be in normal use, otherwise it will bring unnecessary trouble.