1. Windows Central Question's Avatar
    No sound at all
    04-27-2016 08:02 AM
  2. TechFreak1's Avatar
    Please join the site so you can reply in this thread. See this link for instructions on how to join Windows Central.

    1) Is your 640 running Windows phone 8.1 or a insider build?
    2) Have you tried the "use an alternative audio connection for speech"?
    3) Have you checked if the car audio has a separate volume control for bluetooth in the settings?
    04-27-2016 09:49 AM
  3. oviedofreak82's Avatar
    Also what mind of vehicle do you have?
    04-27-2016 10:06 AM

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