This will be huge, I too have no cell phone service in my house. If the phone happens to ring, I have to grab it and run outside like a crazy person to keep the call. I'd gladly use my own WiFi connection to have a single number in and out of the house.

The screen technology has been around for a while. They had a sweet frameless glass panel widescreen TV at Home Depot Expo a while ago. A short throw rear projector provided the image, and it looked like it appeared in mid air.

DuPont actually makes a film you can apply to any glass surface to do this. They use them for ads on storefront windows. I haven't been able to get a sample or purchase the film at a reasonable cost.