Sounds off topic, but really isn't. For those of you who don't have Apple stuff, it is possible to receive/answer SMS messages and do video conferencing on Mac computers and iPads that do NOT have a cellular radio. However, to do so does require an iPhone, else you could not receive calls or messages. So I think the Show and Echos will mostly work without a phone in the mix, but I doubt you will get calls or messages without a registered phone. I suspect it will work similar to the way Apple allows calls and messages on multiple devices.