Is Beijing Mobile's SMS query traffic accurate or not?

SMS query traffic is data delayed by 4-6 hours, and the accuracy is OK. But the housekeeper on the internet is not necessarily the case. Because Beijing Mobile's Internet access has preferential traffic hours (from 11: p.m. to 7: a.m. the next day), for example, if you spend 1M during the preferential period, the SMS query will be directly counted as 5M for you, but the Internet housekeeper will only count as 1M. That's why you sent a text message to 186 to check the remaining traffic, which is 1 meters more than that of the online housekeeper.