You can use your mobile phone number to log in to the homepage of the online business hall, click "Call Charge Inquiry" > "Bill Inquiry" > "Detailed Invoice Inquiry", and select the detailed invoice you need to inquire (such as: call details, SMS and MMS details You can query your detailed bill status in the past six months (including the current month) by clicking on the "Bill, value-added service detailed bill, Internet traffic detailed bill, WLAN detailed bill, etc." If you have any questions, you can also contact China Unicom customer service in the place where the number belongs to verify.