Internet Tether for iPhone after 3.1 3G

3.1 has fixed this issue, and to my knowledge, no one has come up with an alternative.
Macbook Pro Mac OS X (10.6.1)

You could try this for Internet Tethering - they claim it works for firmware version 3.1 on an iPhone 3GS.
http://iphone.unlock.no/
17" MBP 2.5GHz Intel Core 2 Duo NVIDIA 8600M GT 4GB RAM Mac OS X (10.5.6) AEB 802.11n, 2 x AEB 802.11g, Airport Express

I posted this thread and hope I can help some of you out there.
My question was:-
I have an iPhone 3GS purchased in Taiwan which is factory unlocked. Tethering worked perfectly prior to the 3.1.2 upgrade.
Does anyone have any solution as to how I can get tethering back without having to unlock or hack the phone? Perhaps a way to downgrade the phone back to 3.1. How about iTunes? Will it keep asking me to update my phone each time I sync?
Thanks in advance.
I have found a solution that works for me.
1. Go to Settings
2. Press General
3. Press Network
4. Press VPN
5. Switch VPN on then off
6. Press Add VPN configurations
7. Press Auto under the Proxy settings
8. Press Cancel
9. Go back to main screen
10. Go to Settings
11. Press General
12. Press Network
Your Internet Tethering should be back.
I did not make any changes, hack the phone or download any updates (I dont there has been any since 3.1.2 7D11 and I got tethering back.
Good luck.
Macbook Air Mac OS X (10.6.1)

You cannot use tethering until ATT releases their tethering plans.
MacBook , Mini (10.5.8), Airport Express, iPhone 3G x 2 Mac OS X (10.6)

Read the post properly please.
Macbook Air Mac OS X (10.6.1)