Hello, there are several reasons and methods: 1. If the mobile phone prompts that the QQ number/password is wrong, reply repeatedly and enter the correct QQ number and password, paying attention to the letter case format; 2. If the old QQ dating service has been opened on the mobile phone, and the advanced user service has been opened for the QQ number, you need to close the QQ dating service according to the SMS prompt received by the mobile phone; 3. If you are prompted that the QQ number has been enabled for advanced user service by other means, you need to change the QQ number again. Note: If this QQ obtains advanced user service by opening QQ dating/entertainment service through other mobile phone numbers, you need to cancel the payment service of other mobile phones.