I've never had a big beef with AT&T until NOW! I recently loaded iOS 4.3 on my iPhone 4 and wanted to turn on the new "HotSpot" feature. I went to the AT&T "MyWireless" web site and went through the steps to modify my plan. I thought it would be as simple as selecting tethering and paying the extra monthly charge. Boy was I wrong! When I got to the features selection page, this is what I found:
You can see that I am "grandfathered" into the unlimited data plan for $30/mo. The two tethering choices include their 2GB "DataPro" plan. Choosing either of these kills my unlimited plan according to this warning on the same page:
I wanted to make sure this was the case so I called AT&T and the agent confirmed my suspicion. If you're grandfathered in, TURNING ON TETHERING KICKS YOU OUT OF THE UNLIMITED DATA PLAN!