Here are the steps to unlock HTC Touch for any network :

•  Copy 'Cert_SPCS.cab' on your phone & install (run).
  

•  Copy 'EnableRapi.cab' on your phone & install (run).

• Connect Your HTC with PC
  

• Establish an Activesync connection with your phone.

• Unzip the zip file & Run "Unlock_Touch.exe"on your PC. (Make sure the ActiveSync connection is still running)

• File "unlock_code.txt" thus generated will have your unlock code( Eight-digit number).Ignore any other digits if generated.

 You can download the file from here: