Today is the beginning of this month. Dynamic cards have package services, such as surfing the Internet, sending short messages and so on. What service do you have? After deducting these services and adding the phone bill, it is 37. Dynamic services always charge first. If it is a discount package, it will be deducted at the beginning of the month and the discount money will be returned to you next month. When you pay the bill, there will be a "discount of xx yuan" on it, which was deducted from the package at the beginning of the month.
For example, our dynamic 8 yuan includes Internet access in 5 yuan, SMS in 5 yuan and MMS in 3 yuan. It seems to be 13 yuan. In fact, there was a discount from 5 yuan when the payment invoice was issued at the beginning of last month. So 13-5=8 yuan. There will be no extra charge.