I am unable to switch on/off the embedded WWAN device on my Sony laptop on Windows 7.

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If you use the VAIO Smart Network utility without installing the DLLs/Shared Libraries from Sony, you will hit this. This utility, which is used to control the WWAN device, can only be used if you install the pre-requisite libraries and DLLs. The solution is to ensure that these libraried/DLLs are pre-installed before installing/using the VAIO Smart Network utility.

For the same, (VGN-TZ21VN/X or VGN-TZ class models) you can use the following simple step-by-step procedure:-

  1. Download the Sony Utilities Package by going to the following location - https://support.vaio.sony.co.uk/downloads/info/info.asp?site=voe_en_GB_cons&url=Vaio/Original/TZ21_Utilities.zip&ip=Preinstalled_Utilities.htm.
  2. Accept the License Agreement
  3. Accept the download and save the file to a local folder (about 150 MB)
  4. Extract the ZIP file
  5. Go to Utils Installer 1 SonyUtils DLL folder
  6. Run the setup.exe and follow the on-screen instructions.
  7. After completing the above setup, go to Utils Installer 2 Sony Shared Library folder
  8. Run the setup.exe and follow the on-screen instructions.
  9. After completing the above setup, go to Utils Installer VAIO Control Center folder
  10. Run the setup.exe and follow the on-screen instructions.
  11. The above steps would install the pre-requisites to install the VAIO Smart Network utility.
  12. Now download the VAIO Smart Network Utility:-
    1. Go to https://support.vaio.sony.co.uk/downloads/info/info.asp?site=voe_en_GB_cons&url=VAIO/Updates/EP0000165709.exe&ip=EP0000165709.htm
    2. Accept the License Agreement
    3. Accept the download and save the file to a local folder (about 5 MB)
  13. Now you can use VAIO Smart Network Utility to switch on/off the WWAN device. You can now install the device driver and corresponding connection manager to use the device.