A bsdiff patch to apply to CommCenter in 3.1.2 to re-enable tethering is available here for the 3GS and here for the 3G. It's just a 2-byte patch as shown below (and an appropriate readjusting of the mach-o's codesign hash):
USE THIS AT YOUR OWN RISK! Your carrier may end up charging you for unauthorized tethering access.
Update #1 It looks like a lot of people have been looking at CommCenter lately because IRC user CleanAir
had a similar tethering patch. Meanwhile over in the 2G CommCenter, WhiteRat
and geniusan
have patched in native MMS support for that platform. Kudos to CleanAir, WhiteRat, and geniusan for digging into CommCenter and coming up with patches!
Update #2 A few tutorials have started to pop up. Eventually this will be made a part of the normal PwnageTool flow but for now this is best left for the adventurous users out there!
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