Do this with a reg editor:

Hack Internet Sharing to work:
Navigate to HKEY_LOCAL_MACHINE\Comm\InternetSharing
Delete Extension key,
set/create MaxCMCon=0 (decimal).

Navigate to HKEY_LOCAL_MACHINE\Comm\InternetSharing\settings
Delete ForceCellConnection
[Now, if you have unlimited data and in the internet sharing program select sprint (not PAM) then you can tether to a computer and you will not be charged any extra)

if you were like me i had to move the MaxCMCon=o file to shareing and then deleted that and forcecellconnection