What is the reason why SMS verification code can't be received and then failed to be obtained?

First, confirm whether the website supports mobile phone number registration or obtaining verification code.

Second, check whether the mobile phone number is entered correctly. If it has not changed, get the verification code again.

Third, check whether the mobile phone is in flight mode, no network or search state, and choose a place with network to receive the verification code. If this situation persists for a long time, it is recommended to replace the SIM card first and notify the operator to report the error. If there is something wrong with the mobile phone, please replace it.

Fourth, check whether the website is a SMS verification code or a voice verification code, and see if the security software intercepts it and regains it.

Knowledge expansion

1. Websites or client applications need the function of accessing SMS verification code (mobile phone verification code), which can verify the correctness of registered users' mobile phone numbers and ensure the authenticity of the mobile phone numbers filled in by users.

Technical realization:

1. The user fills in the mobile phone number and clicks the "Get Verification Code" button.

2. The website or APP generates SMS verification code according to the rules, and sends the user's mobile phone number and verification code content to the verification code SMS platform through the SMS verification interface.

3. After a series of judgments (account balance, content compliance, mobile phone number compliance, and the operator to which the mobile phone number belongs), the verification code SMS platform submits the information to the server of the corresponding operator.

4. The operator sends the SMS content to the user's mobile phone.

Similarly, the process of retrieving the password and getting the coupon is similar to this.