USB tethering means internet sharing. It makes your phone a WiFi router and allows you to share your phone's Internet connection with the connected PC. Tethering works when your phone is connected to the Internet via mobile data or a WiFi network.
To enable it:
1. Go to Settings> Network & Internet> Hotspot & Tethering> USB Tethering.
2. Connect your phone to the computer with the USB cable.
3. Connect to any WiFi with network access or insert the SIM card to Phone (2) with the available data network.