Why did Ping An send me a short message when he knew my birthday?

Because of these Ping An insurance and so on, well, I have to know your identity information. Your identity information is stored in their company platform, and then he will send you messages and send messages of blessing. Happy birthday!

Or ... Our identity information often appears on the internet, and then someone will find out, and then he will know. Then you will know your date of birth and your mobile phone number.

So don't reveal your personal information online when you have nothing to do, or you will be targeted by some people.