1. If you didn't receive the verification code during the cancellation, it may be because the network connection is unstable or the signal is not good. Please check the network connection of the mobile phone to ensure that the mobile phone runs in a good network environment.

2. It may be that there is a problem with the APP system, which causes the verification code not to be sent normally. You can try to operate the number withdrawal process later, or contact the customer service of Guang 'anmen Hospital to consult about the number withdrawal.

3. In the process of returning the number, you may have entered the wrong mobile phone number or other information. Please check the information entered carefully to ensure that the mobile phone number and other information are correct.