You can stop with all the reasons about how you need it, right now, because it's all a bunch of excuses. Sure, I get that the cell phone may make some things easier, and they're certainly nice to have in case of an emergency, but you don't need it.
I know. I know! How can I say that? Right?
I can say it because humanity survived without cell phones for, well, thousands of years. In fact, we even survived the 80s without cell phones and, if we can do that, anyone can do that.
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To find out the rest, you will have to head over to Indie Writers Monthly. Just do it!
[Note: I am out of town at the moment. I'll respond to comments as soon as I return. Okay, well, not as soon, but sometime after that.]