1. Visit official website: Open the phone platform of Expo Science and Technology Cloud 400, click "400 Phone" and select the "Register Now" button to complete the registration.
2. Submission materials: Fill in relevant materials according to your company's situation and needs, including company name, legal representative, company address, etc.
3. Review: The applicant service company will review your application and ask about your registration.
4. Choose a package: choose a package that suits you according to your needs, and click the "Buy Now" button to complete the selection.
5. Payment: After selecting the required fee, click the "Pay Now" button to complete the payment.
6. Waiting for the opening: Please follow the instructions of the service company and wait for the opening of the 400 phone.