It was mostly a quip about replacing the convenience of something that fits in your pocket and is handheld. I like the idea, it could work for some people. Definitely not me, I'm not in front of a screen / PC for almost all of my day. I do stay in touch with people via texts / calls throughout the day however.

I guess it can have its uses, but it would definitely not replace a mobile phone for me. It may be good in an office where you get your calls by the computer and indeed for internet connection on a laptop, but it will not replace the ease of going somewhere and calling your friend to say "I'm in the square, I don't see you let's meet at this bar".