In Unicom, is it to deduct the money from the bank card or the phone bill?

When China Unicom collects traffic charges, the order of deduction is to deduct them from the balance of telephone charges first. If the phone bill balance is insufficient, it will be deducted from the bound bank card. Therefore, if your mobile phone number has enough phone bill balance, the money in the bank card will not be deducted when charging traffic, but will be deducted directly from the phone bill balance. However, if your mobile phone number does not have enough phone bill balance, you need to deduct the corresponding fee from the bound bank card. It should be noted that the business in different provinces is different, so it is recommended to consult local customer service or check the relevant regulations.