Can China Unicom 4G users add traffic?

Unicom’s domestic traffic generally includes 3G domestic traffic packages and domestic traffic half-year packages. In addition to the prepaid 20 yuan package, China Unicom's 3G packages can also open domestic data packages. Currently, there are three domestic 3G traffic packages: 10 yuan for 100MB, 20 yuan for 300MB, and 30 yuan for 500MB. Send the corresponding SMS instructions to 10010 for processing: (1) 10 yuan package: "KT3GLL10" will take effect the next month, "LJKT3GLL10" Effective immediately; (2) 20 yuan package: "KT3GLL20" takes effect next month, "LJKT3GLL20" takes effect immediately; (3) 30 yuan package: "KT3GLL30" takes effect next month, "LJKT3GLL30" takes effect immediately; traffic half-year package: some 2G, 3G and 4G packages can be combined with a half-year traffic package. Currently, the half-year traffic package is only 80 yuan/6 natural months (excluding the month of application) through China Unicom's online business hall, China Unicom mobile phone business hall, and SMS, and includes 1GB of national Internet traffic. "