Turn on WiFi Settings on your phone, select a WLAN name, and enter a password to connect. The working principle of portable WiFi: Use the wired network, the wireless Internet chip (sim card) provided by the wireless carrier or the computer's own Internet connection as the network source, and establish a wifi hotspot sharing network on this basis. Through this set of devices, the non-wifi access of the Internet connection can be extended to the wifi network for the Internet terminal use. Among them, the portable wifi that only uses 2.5G, 3G or 4G as the network source is also called mifi.