I had the same issue. However I had the same issue with my Samsung Galaxy S4 when I was using it and also signed it to hangouts on another phone. I think it's some sort of issue when you try and run hangouts on multiple phone devices. Since they try to verify your phone number when using it on a phone. So I'm pretty sure it's not a G2 specific problem. Ultimately I had to reset the phone numbers in the hangouts app settings.