I have been looking for the same for quite a while but I don't think that there is any way around this. I want to use my GV number but not the GV service. I think it only works if you use a VOIP service.Go into the GoogleVoice app and select "use my google voice number" that will show your google voice number on any caller ID. It will also, however make all your calls via/through GoogleVoice which can be problematic at times (voice quality is often hit-or-miss at best).