How does China Mobile deduct 10 yuan 2g traffic packets every month?

The monthly 10 yuan traffic package covers 2G domestic traffic and is valid from 0: 00 on 23rd of the month to 24: 00 on the last day of the month after ordering. When it expires or runs out, the subscription is valid at one time, and each user is limited to ordering five times a month. The priority of the month-end package is lower than the traffic priority of the main package and optional package, that is, the main package or optional package can only be used after the traffic is used up. If you need to handle it, please edit the short message KTYMLLB 10 to 10086 to open the end-of-month traffic package, and a short message will remind you of success.