To set up iPhone USB tethering, follow these steps:

The biggest drawback of Wi-Fi tethering is battery drain. Running a mobile hotspot consumes massive amounts of power, and your iPhone battery can deplete in under two hours. When you tether via USB, your iPhone draws power from the computer (or the wall outlet if using a pass-through adapter). You can stay connected for hours without worrying about your phone dying.

Unlike Wi-Fi hotspots, the data travels through the wire.