Every time I go to QQ, I have to send text messages on my mobile phone. What is the function of QQ?

If you don't open other charging services, it may be that your password is in an unsafe state. In order to prevent your password from being cracked, the system requires you to send a text message to confirm.

Give me a suggestion. Change the password to see if it is ok.

If not, I'm unconscious and I know what's wrong, hehe.