Why does qq send text messages with its mobile phone number? What happened?

Qq sends short messages with mobile phone number. In order to improve the security of accounts, QQ has implemented a mobile phone registration mechanism. QQ requires users to provide a valid mobile phone number for verification when registering, which can avoid problems such as registering false accounts and malicious attacks. The user's QQ number will also be bound to the mobile phone number. Users need to enter their mobile phone number and corresponding verification code when logging in to ensure the safety of users. In this way, QQ can better protect users' privacy and account security.