With internet tethering enabled you can use iPhone internet connection on you desktop or notebook. Here is a quick tutorial for experienced users. For everybody else - just wait for the new version of PwnageTool or some other utility.

Here it is:

A bsdiff patch to apply to CommCenter in 3.1.2 to re-enable tethering is available here for the 3GS ^[1] and here for the 3G ^[2]. 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 have patched in native MMS support ^[3] for that platform. Kudos to CleanAir, WhiteRat, and geniusan for digging into CommCenter and coming up with patches!

Update #2 A few tutorials ^[4] 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!

sub_17538+74   4B F0 58 F8                 BL      validate_signature
sub_17538+74
sub_17538+78   30 B1                       CBZ     R0, FAIL        ; <--- PATCH THIS TO 00 20 (MOV R0,#0)
sub_17538+78
sub_17538+7A   05 20                       MOVS    R0, #5          ; int
sub_17538+7C   1C 49                       LDR     R1, =aValidatedWirel ; "Validated wireless modem connection wit"...
sub_17538+7E   02 9A                       LDR     R2, [SP,#0x24+var_1C]
sub_17538+80   7E F0 00 ED                 BLX     _syslog
sub_17538+80
sub_17538+84
sub_17538+84               loc_175BC                               ; CODE XREF: sub_17538+70j
sub_17538+84   02 9C                       LDR     R4, [SP,#0x24+var_1C]
sub_17538+86   05 E0                       B       loc_175CC
sub_17538+86
sub_17538+88               ; ---------------------------------------------------------------------------
sub_17538+88
sub_17538+88               FAIL                                    ; CODE XREF: sub_17538+78j
sub_17538+88   05 20                       MOVS    R0, #5          ; int
sub_17538+8A   1A 49                       LDR     R1, =aCouldNotValida ; "Could not validate wireless modem conne"...
sub_17538+8C   7E F0 FA EC                 BLX     _syslog
sub_17538+8C

bsdiff patches are the normal way that PwnageTool modifies Apple software. To apply one manually, you must first get the “bspatch” program. Then do:

bspatch CommCenter CommCenter-hacked CommCenter.patch

If you don't have bsdiff but know how to use a hex editor, the differences are available here ^[5] in text format.

The correct SHA1 of the hacked file will be:

1b19712035f33654cf72838ebe1a2033931b56b2   # 3GS
063165c3fa3e21d30eb4b486fab924ba3ef0ea5e   # 3G

You would then remove the original program and replace it. Don't forget to ensure it has execute permission!

chmod +x /System/Library/PrivateFrameworks/CoreTelephony.framework/Support/CommCenter

After you've started using the hacked CommCenter, visit http://www.benm.at/help/help.php ^[6] from your iPhone and install a new mobileconfig.

via wikee.iphwn.org ^[7]