hello, "current available balance of account" = available balance of account this month-consumption limit of real-time telephone charges this month, which refers to the real-time balance of your telephone charges. If you owe money, your available balance is negative or zero. You can log in to the mobile phone business hall APP of China Unicom, and click "Service > Inquiry > Telephone Fee Business Inquiry > Account Balance". According to the consumption of your account, the page will display the current available balance of the account and the arrears.