1. If you add friends, you can ask your friends to check your QQ number directly in the friends bar.
2. Check your computer with QQ number to see if there is any login record, or if there is a folder with your QQ number in the QQ installation directory.
3. If you remember the QQ nickname, you can try to log in to other QQ numbers and use the "query" function to find it.
If you are a free number applied for by a web page, you can't get it back by the above methods. I suggest you apply for a new QQ number.
If QQ is stolen, how to get it back:
1. Open the QQ software and click "Retrieve Password" on the right.
2. Enter the corresponding verification code given to us by the system in "Verification Code", and then click Next.
3. In the password management options panel, click Verify Password and Retrieve Password.
4. In the "Unable to verify, try something else" drop-down menu, we choose the secret protection question.
5. In the question of "secret protection", we input the corresponding answer. After losing, we will click "Verify".
6. Enter the new password and click OK.
7. "Congratulations, the QQ password has been modified successfully!" So that you can get the stolen QQ number back, but this premise is that it has been kept secret before.