Sorry if I misunderstood your question, but in the first part you said you wanted to use GV to make free calls on the Optimus V.
But that can't be done with the GV app.
You will probably find it a lot easier to set up GV on the PC to make sure everything is working if you just got the GV number.
After everything works on the PC and you have setup your forwarding to a working number like your home phone or a cell phone and you can place a call from Google call phone either from within Google Mail or with Google Talk, you then need GrooveIP app on your Optimus V.
Then go into GV on the PC and set the forwarding to Google Chat.
In GrooveIP you enter your Google email and password associated with your GV number.
After that you can then make and receive calls on the Optimus V using GrooveIP and your GV account.
the Google Voice app is not needed at all on the phone.
I see this is an older thread but it fits with my question. I recently got two Optimus Vs and set up Google Voice with PBXs.org and Sipdroid and enabled Google Chat. I use the option to choose whether or not my calls are made with Google Voice but I have always chosen the option to use Google Voice for my calls. The other day my call dropped and I found out that all of my call were counting toward minutes. I plan to use the 300 minute plan because our old plan for two phones was $75.00 with tax, so the unlimited $55 per phone is not a good choice. Will Groove IP do a workaround so that the calls are not recognized as voice calls? Any other suggestions? Thanks.