Now now, even I wasn’t sold at first, but I learned that a cell phone is not only very useful, but now practically indispensible to my life.
The camera function, for one. Take a snapshot anywhere, anytime, and if it doesn’t turn out okay, just delete it and try again. I can’t tell you how much time this has saved from writing things down from a TV screen or monitor.
Or the alarm clock function! A godsend, I tell you. Never have to wake up to some horrible song or annoying commercial again, nor worry about an inconvenient power failure.

But seriously…yes, cell phone users can get annoying, but I haven’t noticed any appreciable spike in public annoyingness. The only thing that’s changed is the medium. As for the shouting, I think that has to do with making calls from places that generally aren’t suitable for making calls, i.e. places with lots of background noise. Whenever I have to make a call from a mall, I have to hunt as many as 10 minutes for a suitable location. Trust me, it’s not easy to be heard in a place like that, especially with other cell phone users in the vicinity who are also trying to be heard.
Me, I leave it on only if I want to be contacted for some reason, and anyone offended by this will just have to be offended.
(P.S. I’m not the only one using the alarm clock, camera, calculator, etc., am I? Be such a waste not to make good use of them.)