What does two-way authentication of mobile phone mean?

1 and 12306 push mobile phones for two-way authentication, which can prevent identity information from being registered. It is understood that users need to send SMS 999 to 12306 using the mobile phone number left when registering. Then 12306 will reply a 6-digit short message to the mobile phone. New users need to enter a 6-digit verification code within 10 minutes to log in to 12306 website. Citizens who have not purchased tickets through the website 12306, whether they register their accounts at 12306 or are added as common contacts by relatives and friends, must pass the identity verification first, otherwise they cannot purchase tickets normally.

2. After two-way mobile phone authentication, your personal mobile phone number will be one-to-one bound with my ID number registered in account number 12306, and others can no longer use it, thus avoiding the risk of fraudulent use and misappropriation of identity information.

3. Once the prompt "duplicate identity information" is found in the two-way verification process, it means that your ID card has been registered by others. You need to bring the original valid ID card to the ticket window of the station to handle it again, and you can't entrust others to handle it. After the window is completed, existing registered users can log in to 12306 website to modify their identity information.

4. It is worth noting that at present, the railway department requires all 12306 users to complete the two-way verification of mobile phones before 12.3, and users who fail to complete the verification within the specified time may not be able to purchase tickets through the Internet. However, the railway department said that specific remedial measures are still under study for users who have missed the verification.