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How to display the remaining phone bill on Apple 13 mobile phone?

Unicom customers can inquire by themselves in the following ways:

1, China Unicom APP: door-to-door-service-inquiry-remaining phone bill;

2. China Unicom Online Business Hall: Home Page-Inquiry-Telephone Fee Business Inquiry-Account Balance.

3. Call the local Unicom customer service hotline 100 10 IVR for enquiry.