Call the police or you can change your cell phone number. Do not contact him. If the micro signal is a real-name registration system, it can be retrieved through Tencent. Zhihu's account password can be retrieved through account appeal. Operation method. If you forget your password on Zhihu, you can click Forgot Password when you are logged in. Enter the password management of Zhihu Security Center, and then click "Modify Password". Before changing the password, be sure to remember the numbers used before. The more the quantity, the better. Finally, the modification was successful.