How does China Unicom handle the available traffic in Hong Kong?

Hello, China Unicom can apply for the 100M roaming data day package of 20 yuan package when roaming to Hongkong. You can apply for opening through China Unicom's own business hall, online business hall, 100 10 customer service hotline and SMS. Send "KTGM2" to 100 10 after the SMS is opened. Send "QXGM2" to 100 10 when canceling. If you are already in Hongkong, you can call Chinese mainland at+8618610010 to apply for opening. It will take effect immediately after the application, and the cancellation will take effect from 0: 00 the next day, with daily billing at Beijing time. After opening, no traffic will be generated on the day of arrival in Hong Kong, and no package fee will be charged. If you generate data traffic, you will be charged a subscription fee. 100MB roaming data daily package is a high-speed internet package, which is automatically superimposed by the system, and there is no limit to the superimposed data. Thank you!