Characteristics of android phones already in the root

1. Connect your phone to PC with data cable
2. Go to cmd from the Windows desktop. Start>Run type cmd then click OK
3. In the cmd (Command Prompt) entry into the Android SDK directory
          cd\
     cd android-sdk-windows\tools 
4. If the directory has been changed to c:\android-sdk-windows\tools>  type:
     adb shell
   if the output is the $ sign, type again the command su. If your phone is already in root, 
   the $ sign will be changed to #.
          c:\android-sdk-windows\tools>adb shell
     $ su
     #
5. If after you type su remain on the $ sign then your phone has not diroot