You can install the package that is used in the video, it is mentioned here LuCI APP: luci-app-3ginfo - 3ginfo gui (Info about 3G/LTE connection) - #28 by IceG
You can install the package that is used in the video, it is mentioned here LuCI APP: luci-app-3ginfo - 3ginfo gui (Info about 3G/LTE connection) - #28 by IceG