I try to pre-warn my girl if I'm going to be incommunicado.
But while everyone "worries" it's unfair to assume the worst or even assume a callous disregard.
I live rurally and lose services all the time. My cell here, even with the red map, is spotty. Plus I can't tell you how many times when on the road I just don't have service. There are family venues where I mute the ring-tone or just turn it off all together. And plenty of times where I can't plug in the recharger so I save my batteries.
Then there is the whole issue of being an independent soul. The "connected-paradigm" has changed. You may be part of the more current generation who feels out-of-sorts being out of touch. But some of the older generations, myself included, couldn't wait for our independence from parental oversight (back before cell phones

heheh ) and I find myself still rebelling against requirements to stay in touch. It takes a concentrated effort on my part to "check in".