What does China Unicom mean when it asks me to keep spending 28 yuan every month to get data?

After participating in the low-spend 28 yuan free data activity, during the agreement period, you need to commit to a low-cost spend of 28 yuan per month, and you can enjoy the monthly traffic discount of the corresponding level. The actual consumption amount in the month is less than 28 yuan. Yuan, the system will deduct the monthly package rental and other fees after making up for the difference in the next month.

Warm reminder: There are differences in the business policies of various cities, and the specific policies of the place of residence shall prevail.