1. You have to make sure whether the place you want to go has 3G network coverage (or mobile, China Unicom, telecommunications), and then decide what kind of equipment to buy (you said like a USB flash drive).

2. I don't know which province and city you are in. There are regional differences in tariffs, (we are 3672M a month in 60 yuan).

3. The tariff card can be plugged into a mobile phone, provided that the mobile phone is a 3G mobile phone (tariff card and mobile phone are the same operator, for example, Unicom card should be plugged into Unicom WCDMA mobile phone, and telecom card should be plugged into Tianyi CDMA2000 mobile phone to realize high-speed Internet access).