I have Google voice, hangouts and the dialer plus use the messenger for fb app, but when i make/receive calls voice or video they can't hear me. I can hear them though. How do i fix/enable this?

To answer that requires more information. What brand tablet is it? Even tablets that have SIM cards and can use mobile data do not actually have call capability like a cell phone. However, any tablet with internet connection, either by wifi or mobile data, can make and receive calls, texts, and even video calls, using an app such as Skype, Viber, Google Hangouts, or even Facebook Messenger. When you use an app like that you make and answer calls using the app. I have not used Facebook Messenger for calling, but I have used the others. All are available for Windows or Android.

You can use your internet connection to make a call. Tablets use a technology called Voice Over IP to send voice and video calls to regular phones.

1. Make sure the mic is not set to mute.
2. Check your battery charge. Low charge may turn off video.
3. Your operating system appears to be Marshmallow. I am not sure what application you are attempting to use for voice chat. It might be Google Duo, Facebook Messenger, Hangouts, or Imo, among others. If an application is not working, one generally tries reinstalling it.
4. Another application may be running and blocking use of the mic. Check what else is running. I think holding down the home button will reveal what is running. Shut down background apps and test the app you are using. Google Play may have What's App to check this.

Go to the Google app store and download it from there.

There are several available including skype, BBM, Hangouts, ICQ, JusTalk, and KakaoTalk

Hi disable call forwarding to you're mobile number in your voce account after this only the hangouts will ring good luck

How to delete messages on Facebook Messenger Mobile App

Open Facebook.com in the browser. Save it as. A webapp story it on the springboard or home screen as your kind call it.

Messenger messages and attachments work on fb.com

try to log in with other google id
or else you can install hangout ffrom non google market like mobogenie market
:)