Accidentally turned to the phone, with NFC function. I don't know how to use it What is the function? I saw a key chain with NFC on the Internet.

At present, the application of NFC technology in mobile phones mainly includes the following five categories.

1. Contact passes, such as access control, tickets, etc. Users only need to store tickets or access control passwords near the card reader, which can also be used for logistics management.

2. Contact payment, such as contactless mobile payment, allows users to pay by placing the device near the POS machine embedded with NFC module and confirm the transaction.

3. Contact connection, such as connecting two NFC devices for point-to-point data transmission, such as downloading music, exchanging pictures and exchanging address books.

4. Contact browsing, users can connect NFC phones to smart public telephones or street posters with NFC functions to browse traffic information.

5. Download contacts, users can receive or download information through GPRS network for payment, access control and other functions. As mentioned above, users can send short messages in a specific format to the domestic helper's mobile phone to control the authority of the domestic helper to enter and leave the house.