Ah ok..those plans are monitored pretty well i believe,Id watch using to much data@tethering...just my thoughts to avoid getting red flagged in the system...
Yes, true its monitored. Although very inconsistent reports here on how they monitor or enforce. Some claim to tether lots of data without being busted, others have apparently gotten caught with very little tethering usage.
I don't use it often, usually just here and there to download/upload work email to my laptop when I'm travelling and in a location with no WiFi, or slow crappy hotel WiFi. Low volume and very infrequent, and I've been doing it for years with no issue (grandfathered unlimited data plan).