I.C.S. Reg Edit: No need to install a cab and take up space.
Go to
Commonly requested & popular software/applications and DL yourself a
Registry Editor app then make the changes and you'll be fine.
InternetSharing WM 6.0:
Go to [HKEY_LOCAL_MACHINE\Comm\InternetSharing]
Then Delete "Extension"="rilphone.dll"
then change "MaxCMCon.... from 1 to 0..
MaxCMCon might be 0 already if so its cool.
InternetSharing WM 6.1:
Go to [HKEY_LOCAL_MACHINE\Comm\InternetSharing]
Then Delete "Extension"="rilphone.dll"
After that edit the dial "Phone as Modem" to "Sprint PCS"
MaxCMCon will already be 0.