China's top three major telecom operators will launch rollover data services on Thursday, meaning unused data at the end of the month will no longer just disappear.

三大电信运营商将自10月1日起推出“当月流量不清零服务”，即月底未用的套餐内剩余流量不会清零。

除了上文提到的rollover data service，“当月流量不清零服务”还可以用allow users to carry forward unused monthly data allowance的方式进行表达。