What does mobile company traffic carry-over mean?

The unused traffic last month is carried forward to this month's traffic.

Traffic carry-over means that the domestic traffic in the basic tariff package last month or the domestic traffic in the current month's traffic package is not used up and carried over to this month. Carry-over flow is limited to use before this month and will be cleared next month. Carry-over traffic refers to the traffic that was not used up last month and carried forward to this month.

The scope of the current month's uncleared traffic service is mobile phone packages with monthly traffic charges, including basic packages with monthly traffic charges and optional packages with traffic charges. Such as 4G flying package, 4G traffic optional package, night traffic package, etc.