How does China Unicom inquire about the balance of broadband charges online?

Unicom 3G users can edit the short message content 74 13 and send it to 100 10, and then operate according to the reply information, so as to query the broadband (local area network) account balance.

Unicom 3G users can edit the short message content 74 12 and send it to 100 10, and then operate according to the reply information, so as to query the balance of broadband (ADSL) account.

Unicom 3G users can edit the content of the short message 74 1 1 and send it to 100 10, and then operate according to the reply information to query the balance of the fixed telephone account.