Excuse me, what do you mean by Unicom's account balance and available balance? What does the following information mean? Look at the picture below.

Account balance: available account balance+frozen account balance.

Available balance of account: "available advance deposit"+"available grant".

Current available balance of account: "available balance of account"-"real-time phone bill".

The short message means that the available balance of your phone bill is lower than the monthly rent of the package. After deducting the monthly rent of the package at the beginning of next month, you will be in arrears.