The steps of the PC side are as follows: Click the network icon in the bottom right corner on the system desktop. Click [Network and Internet settings] in the pop-up box. Click WLAN on the left handside. Click [Hardware Properties] under [WLAN]. Then you will see the information of network band. The steps for viewing on the mobile side are as follows: Android： Different brands of Android phones are different. Take Huawei mobile phone as an example. You can click on the connected Wi-Fi name in the Wi-Fi list, and the corresponding information will be displayed, including the frequency. iOS： Download AirPort tool in the App Store Turn on the Wi-Fi Scanner in "Settings - Airport Tools"Open the app and click on "Wi-Fi Scan" in the upper right corner. Channel 1-13 band is 2.4G, and larger than 13 is 5G.