Default Tethering with Sammy roms and a blocked provider


i can not tether my S3 with any Sammy rom, because my provider doesn´t allow it.
BUT - i had CM11 on it for a while and tethering was really good.
Unfortunately the experience with CM was a mixed bag , so I am back to 4.1.2 Sammy.

Is there any trick i could make tethering possible?
There must be something that my provider checks with my phone, that sammy supports and CM not.