Where can I buy a plane ticket and place an order? Will the wrong phone number reveal personal information?

Where can I buy a plane ticket? Filling in the wrong mobile phone number will reveal personal information. Judging from the relevant public information, travel platforms and airlines have mastered a large amount of personal information because of the nature of their business, and personal information has also been leaked. Mr. Pang bought the ticket of China Eastern Airlines through Qunar.com, and then received a fraudulent short message showing his flight information, airport name, flight number and so on.