1. account registration: when registering a new account on the education technology platform, the system will send a verification code to the provided mobile phone number or email address to ensure that it is a legitimate user and verify its identity.

2. Security verification: In order to protect the security of the account, Educational Technology will require users to conduct security verification regularly or under abnormal operation conditions, such as changing important information and binding new equipment. In these cases, the system will send a verification code to ensure the security of the account.