Originally Posted by Pjs187
I've never tried the WiFi mode just using it as USB tether, I was getting the upsell page for going over my 5gb hotspot, it doesn't seem to be able to detect the foxfi tether, used over 5gb just today lol
Use Chrome or Firefox on the tethered computer. Then in either, download an addon to change your user agent string from Mozilla / IE to something like android / nexus. You won't get the upsell and your tether will work. The addon is called user agent switcher
Also, make sure you are on epc.tmobile.com APN as they seem to only monitor the ipv6 / fast.tmobile.com ( at least in my market area anyway ).
I'm not a heavy tether user but I've downloaded 7+ gb in a pinch on my winbook tablet to help repair a friend's laptop last month. On the average just using my Netflix , I hit over 30gb / month just on my phone lol.