Step 2: Insert the HUAWEI CarFi into your car's 12 V cigarette lighter socket. Step 3: Press and hold the power button to power on your HUAWEI CarFi. It will automatically connect to the network provided by the SIM card. Step 4: Search for the newly created Wi-Fi network on your device (such as your smartphone, tablet, and portable gaming console). Select the SSID of your HUAWEI CarFi and enter the Wi-Fi key.