12306 failed to send 666

If you do not receive the verification code after sending 666 at 12306, it may be due to the following reasons:

1. Incorrect mobile phone number input: Please check whether the mobile phone number you entered is correct.

2. Network connection problem: Please check whether your network connection is normal. If the network is unstable, it may affect the reception of the verification code.

3. The sent text messages are intercepted: Some mobile phones may intercept the sent text messages. Please check whether there is verification code information in the interception box or trash box of your mobile phone.

4. Sending text messages too frequently: If you send text messages multiple times, the system may limit your sending frequency. It is recommended that you try again later.

If you still cannot receive the verification code, please contact 12306 customer service staff for help.