5.6 makes it where you can never tether. /just kidding
I'll stick with 3.0 and the 6.0 carrier file, until I see a clear reason to upgrade (or downgrade the carrier file). I had earlier went to 3.1, but all that did (for me) was make moving icons around easier. I finally needed tethering for attending a funeral , so I'm pretty much stuck with 3.0 for now, if I want to use the 6.0 carrier file.
I wonder how many new problems will be created with this latest update?
Actually you're correct. Before 3.1.2 I had a tethering info in my usage area and now it's gone.