Wireless connectivity, via phones and more, has changed the way we live, work, and think—that's not news. Watching a movie or TV show from as recent as the 1980/1990s era, where the characters are looking for a phone or waiting by the phone for a call, seems as archaic as waiting for a letter from your kid at camp or a message-bearing courier coming from headquarters.
But the joy of wireless also brings the headache of losing or misplacing your untethered whatever. And problems bring solutions, ranging from the low-tech approach of wearing your tiny cell phone on your neck, to more sophisticated approaches. I saw an article about a few of the most recent approaches in this Wall Street Journal article "A Leash on Mobile Devices That Wander"; there are many other techniques out there.
What's interesting here is the creativity that engineers (and others) are showing in developing solutions to the problem. Some are software-centric, some are hardware-centric, and no single approach will meet the needs of all potential users, which is more than OK.
As for me, I'll probably use my usual KISS (keep it simple, Schweber) approach, and just try to keep my phone close by and not forget it—or I'll use the lanyard around the neck low-tech approach. I don't think I can accommodate any more accessories or add-ons or techniques to manage the tech stuff I already have!♦