How to check last month's bill by SMS?

Unicom's mobile phone number is edited locally and the short message "Historical Bill" is sent to 100 10 to query the historical bill. According to the system prompt reply serial number can query the historical bill. As shown in the figure below:

In addition, you can also log in to the mobile phone business hall APP of China Unicom, and click "service > inquiry > telephone bill inquiry > historical bill" to make an inquiry.

Tips: At present, you can query the historical billing information of 12 months (excluding the current month).