How to open Unicom superimposed traffic package?

Unicom's overlay package can be opened by SMS, and the national traffic overlay package * * * has five files: it can reply "7 133" to open 6 yuan package 50MB, "7 134" to open 100 yuan package 100MB, and "7100mb". Reply "7 137" to open 50 yuan 1GB, and the subscription will take effect immediately and expire automatically at the end of the month. You can order a traffic superposition package between different files in the same month.

Tips: Take Jiangsu Province as an example. There may be differences in policies among provinces and cities, and the attribution policy shall prevail.