This looks like it could come in handy, it can filter what calls to make using GV and what calls to make using the regular cell number. It seems to be what my sister is looking for, she would like to use GV for business and VRZ for personal stuff and this may just be the answer. Anyone tried it? Google Voice Callback - Android app on AppBrain Edit/update: I installed it and set it up and so far it is working really well. The filter is very easy to use/setup and there is only a slight delay in the whole calling process. It will take a bit of getting used to having to answer my phone to place a call but it seems well worth it so far!