Cellphones are no longer a luxury. They are extremely useful in an emergency.
There was a time I sweared off cell phones and decided to live an offline life. I was driving by myself in the middle of Utah on the way to Moab when I noticed the empty gas indicator light up. The communities are hundreds of miles apart and I spent an excruciating long time cruising without AC in the middle of a desert hoping to get to a gas station. I promptly got a cell as soon as I got out of that mess.