Now it is 10086. What SMS can I send to activate the caller ID function? In other words, after someone's cell phone or phone call, Shenzhen and Guangzhou are displayed under the number.

Write "KTLDXS" on your mobile phone and send it to 10086.

Note: The content sent does not contain quotation marks and is case-insensitive.

Caller ID is a caller ID function. After applying for this new service, when answering the phone, the caller's phone number will be displayed on the phone screen, and the customer can decide whether to answer the phone according to the caller's number. Through this function, the mobile phone will automatically store the received or missed phone numbers for customers to inquire.