That sucks that true is doing this now. I'm glad I stuck with my old plan and didn't make the switch to True H yet. They told me if I switched that I'd get to keep my old rate for six months but after that I would have to pay the extra for the SMS and MMS as I'm on the 599 Baht free size plan. Oh well, even with the new rates, True is still cheaper than AIS.
In a related note, AT&T customers are getting screwed over even worse than us:
Confessions of an iPhone Data Hog - WSJ.com
So much for grandfathered unlimited plans. Now its only unlimited up to 2 gigs. If you try to tether on AT&T then they conveniently add tethering to your plan with a nice monthly fee.
I wonder if they are throttling when I use my wifi tethering on Android. I'll have to play around with it a bit.