The short answer to what happens when you phone or other wireless device shuts off is nothing, you may lose you guage monitor if the power goes off ,but nothing spontaneously happens. We have been testing this product since Early January. It just goes on about its business. This system is miles ahead of what the old SCT stuff was. The switches as of right now are still hard wired so you wouldn't even lose that aspect of your tuning. The way we have to look at it as tuners is..... this is another product that can deliver our product to the end user securely. bottom line is there are sever products on the market. Efilive works great..... MM3 works exceptionally well..... Ezlynk is another delivery platform that the end user can choose. Some of our ford guys have went as far as to mount I pads into their dashes and that makes a neat project combined with this product. As far as it being a disaster its early yet but seems like a very legit product