Well here I am to tell you that I'm still having a very hard time with this app . I have taken the sim card out of my Exhibit II and made calls through G IP connected to my WIFI at home. The first time I tried it I was so happy... everything seemed to work wonderfully. I then put the sim card in and used the 4G network also in my house. Things were good there too. I then tried using the app while driving (4G with full bars the whole way) and it was not good: echo, my voice cutting in and out, my voice sounded scratchy to the other person, their voice was choppy, etc. I tried some of the fixes in the app settings. But nothing really made a difference. I got back home and tried my old trick again, but I probably had changed so many settings that now nothing worked. I unistalled and reinstalled and haven't had much luck since then. Now I have new issues happening.... the connection to Google Voice is constantly logging on and off, for no apparent reason. The phone freezes to where I can't even terminate the (bad quality) call I'm in... very frustrating... if anyone has some words of wisdom please send them my way. This is happening both on WIFI and 4G at home