Two questions about google voice app. 1) When Google voice is installed on phone and one uses google voice to place a call, are the cell phone plan minutes being used? 2) Is cell phone signal strength relevant to placing a call using Google voice? I am under the impression that google voice does not rely on signal strength but instead on the internet connection. My house does not have good cell phone signal.. can i use google voice on my phone with wifi turned on? and am I actually burning my cell phone minutes while using google voice?