Out of the blue for no apparent effort on my part while plugged in to the computer I usually plug in to at work Internet pass- through came on. This allows me to surf the web without using mobile data or a Wi-Fi network. I haven't received an OS upgrade or anything like that. Any idea why this would suddenly be available? Android version 5.0.1, HTC Sense 6.0, Software number 4.20.531.4.