I have a high level how the one-x mobile sip app works.. I know you need to register to a ASM via an SBC and using a WiFi will save cellular minutes, but wouldn't it still use data, which is actually just as costly? There are some execs that think our roaming charges etc.. are just going to disappear and I'm trying to articulate what will actually happen with this product. Is there a one or 2 liner on the skinny of this product?