I wouldn't say "without the big brother spying...It is google, after all...

In essence, Google Voice is a front-end to all of your phones. You can route calls from google voice to any combination of home- and mobile phones. For instance, say your best friend calls your GV number. You can program it to ring your mobile and home phone simultaneously. Or your wife's sister calls, you can set it up to ring her mobile, then if no answer, ring the home line, and so forth.

--vr