I can confirm that 3.1 breaks tethering.
I used the Benm hack. I am on AT&T. I attempted to tether to my Mac using bluetooth.
What happened was I initially read this thread so I decided to try it out. After I updated to 3.1, I turned everything on like usual and then tried to pair the two. They wouldn't pair so I tried to set up the iPhone as new under Bluetooth preferences and tried it again...still no luck. Then I decided to double check if tethering was on and not just bluetooth itself. So I check on my iPhone and to my surprise, the tethering option which was there a few minutes ago suddenly disappeared. Very strange how that happened..
I used the Benm hack. I am on AT&T. I attempted to tether to my Mac using bluetooth.
What happened was I initially read this thread so I decided to try it out. After I updated to 3.1, I turned everything on like usual and then tried to pair the two. They wouldn't pair so I tried to set up the iPhone as new under Bluetooth preferences and tried it again...still no luck. Then I decided to double check if tethering was on and not just bluetooth itself. So I check on my iPhone and to my surprise, the tethering option which was there a few minutes ago suddenly disappeared. Very strange how that happened..