How to locate COM port number:
All our cables simulate a COM port to communicate with your mobile phone. With most cables you are able to check what COM ports they are using. IRDA (Infrared Data Association) cables do not display a COM Port number.
Step 1
Go to the Device Manager Dialog box:

Windows 2000/ XP:
Start → Settings → Control Panel → Systems Hardware [Tab] → Device Manager [Button] → The “Device Manager” dialog box will appear.
Windows Vista:
Start → Settings → Control Panel → System and then click on Device Manager in the top left corner under Tasks.