There is a credit line for mobile phone bills. What the hell does that mean?

If it is Unicom's credit line, it usually refers to the maximum amount that your phone bill can be overdrawn. When it reaches the credit line, it will stop overdraft consumption; The telephone charges for overdraft consumption can be paid in time according to the regulations.

Tips: There are differences in business policies among cities, and the actual situation of China Unicom shall prevail.