How to open a 7-day traffic package for Unicom card?

Generally, the traffic is monthly, but there is no daily package, but the situation in each province is different. For example, if you are a user of Hebei Unicom's 3G post-paid package (excluding the wireless network card and the application fee of the group's exclusive industry), you can apply for a short-term traffic package, with 300MB provincial traffic 10 yuan, valid for 7 days after ordering, and send KTLL7 to10.