The new redsn0w uses an IPCC tethering hack, one that was overridden by Apple recently, but it appears the cat-and-mouse game is back on.
The site posts a little how-to as well:
Okay, maybe a little guidance is in order here. For clarification, you’ll need the redsn0w 0.9.3 beta to get the IPCC tethering hack working again – find at the bottom of the page via the link above (or here). Once you’ve run redsn0w, you’ll have to download a custom IPCC file (carrier bundle), which tells your iPhone that you are allowed to tether on a given carrier.
1. Point your iPhone Safari browser here, and download an IPCC file that corresponds to your region and carrier.
2. Once downloaded, install the IPCC file and replace your existing carrier bundle.
3. Navigate to Settings > General > Network on your iPhone to enable tethering.
4. You now have tethering enabled on your iPhone 3G/3GS running iPhone OS 3.1.2!
Written by: Andre Yoskowitz @ 21 Feb 2010 12:46
