Where can I get the flow card of Huai 'an Unicom?

You can buy a phone card or a flow card in the business hall.

Unicom's traffic card service is provided by China Unicom for users of the Internet of Things. It takes the dedicated number segment of the Internet of Things as the communication access service, supports basic communication services such as short messages and traffic through dedicated network element equipment, and provides intelligent channel services such as communication status management and communication authentication. By default, the Internet of Things dedicated SMS access service number and dedicated APN are opened.