Tethering still working on 3.1.2 ?
I've read posts that tethering still works under 3.1 but I have not upgraded to 3.1 because I really don't want to lose my tethering right now. The Austrian web site that had the config file to enable tethering on my 3GS says he is working on an update for 3.1 and it is now in testing mode. I wait patiently.
As to being charged, your unlimited data plan is said by some to only include 5GB of data per month, or else extreme charges are applied. 5GBs of data is a lot of web surfing, downloading podcasts, and even YouTube videos. Most people won't use this much data in a month. You can always check your data usage amount in the settings area. If anyone is interested, please PM me for more details on the Austrian site.