What is the most cost-effective traffic package for Unicom card?

This depends on where you are a user, because the traffic packages opened in different regions will be different. If you are a 2G user of China Unicom, some packages can customize 3G provincial traffic monthly and enjoy 3G Internet access speed. There are: provincial traffic 10 yuan, 20 yuan traffic 300M, 30 yuan traffic 300M, 50 yuan traffic 1G, 100 yuan 2.5G, which is quite cost-effective.