Ways to call with Google Voice without mobile service and hangout? Are there ways to make and receive calls with Google Voice on Android 4.4.2 and Kyocera Hydro Icon,  but without mobile service and Google Hangout? 

My Google Hangout has some problem, for which I am still looking for solutions.

My mobile service's signal isn't great in my apartment. So I am trying to use VoIP over WiFi.

Thanks.
you can use Grooveip app or Ringto app which is an alternative to hangouts and works same like hangouts.