Do you mean using your tethering data or aftermarket? My usb tether is working with T-Mobile tethering but the wifi Hotspot won't work, had same issue with my daughter's iPhone 5 which they replaced and it works for her now so I'll have to raise the issue with them soon. I normally use Klink which I purchased 3 phones ago to usb tether and the carrier sees it as regular data usage, it works with my G2 but then it stops after 4 minutes. My other phones all worked but not on stock kernels so thats probably it but give Klink a try if your trying to not run into the out of data message.
LG Optimus G (Sold) Galaxy S4 (Buyer's remorse) HTC ONE (Buyer's remorse) LG G2 (Loved it for a week) Note 3 (Couldn't help myself) T-Mobile
My Note 3 is powered by Darthstalker Rom and LeanKernel (Happy Happy Joy Joy!) 38,378 Antutu