How to find the telephone sub-invoice only by using the mobile phone number?

1. Log in to the mobile phone business hall with the mobile phone number and service password, select "Query" under the "Service" menu, and then select "Electronic Invoice Query".

You can query the electronic invoice. 2. Enter the electronic invoice page. On the electronic invoice query page, select "Invoice or Electronic Invoice" button to enter the electronic invoice page, and select "Invoiceable" electronic invoice to enter the electronic invoice details page. 3. Fill in the relevant information. Enter the mobile phone number (Unicom number only), email address and other related information on the electronic invoice issuance details page (right side of the page), and click "Next" to confirm.