I found this thread while I was searching for some answers to the problem I'm having with Power Toggles/FoxFi tethering. I have the Galaxy S3 through At&t and haven't even received the Jelly Bean update yet, but with At&t's last OTA update I lost the ability to tether using Power Toggles to activate FoxFi so I can tether for free. I'm not rooted and have used this method without any issues whatsoever to tether for free since I got this phone several months ago. If you use the "native tethering" as some have mentioned you have to activate the service and pay the monthly fee, at least you to with At&t. Anyway, I know this is a different device and carrier, but it seems we are having the same issue so I just wanted to post and watch this thread in hopes of a solution.