My girlfriend is headed overseas next week. We're trying to figure out how to use our phones to make calls over wifi. She has an Incredible and I have an Eris (both on Verizon). It looks like we can't use Skype because it requires Verizon network coverage to work. It looks like Gizmo5 with Google Voice may have been an option at one time, but Google shut that down by acquiring Gizmo5. So my question is, is there any way that we can make calls to each other over wifi?