Error 608: The device does not exist.

First check that the modem is installed. Make sure that the driver installed matches the modem exactly (go to Modems in Control Panel, click Diagnostics, highlight the COM port your modem is listed as, click More Info. Your modem name as listed in Control panel -> Modems should match the one beside ati3) If not reinstall the modem (be careful of WinModems as they often have complicated installation procedures)

If the modem is installed correctly, check that it is responding properly. Go to Control Panel, then Modems. Click on the Diagnostics tab. Highlight the COM port the modem is on and then select More Info. If the modem does respond, check it further by dialling using Hyperterminal.

If the modem fails any of these tests, get the modem checked by the manufacturer. If the modem passed all of these tests, try reinstalling DUN/RAS

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