Harald as recently as 20 years ago, many if not most folks simply weren't within constant reach of others when they stepped outside their door. Yes, cell phones have been around since eighties, but almost no one in my circles carried them even into the late nineties unless it was for work, and even then it was usually a pager.
Obviously, if you have family with special health needs then it is great to have that technology at the ready, but most people can get by with not talking on the phone while they commute to and from work, and many can even go their entire shift without a cell phone.
I am fortunate enough to have wifi just about everywhere I go, but I also don't bother to take my phone everywhere I go. Health issues withstanding, it is okay to be incommunicado from time to time. It can even be liberating.
In many ways, I feel that we, as a society have come to rely on technology for far too much. My own kids won't even consider trying to find an address without GPS in their vehicle, and some even share their locations with their partners 24/7.
I probably just sound old, but I feel like many have forgotten (or have never known) what it means to live independently.