Schrodinger's Dog said:
With all due respect I think that is complete and utter bilge. If anything mobile phones actually remove communications most valuable factors, the ability to read body language or gain understanding from intonation, skills that only come with face to face dialogue. Mobile phones actually lead people to talk less in person and more over the phone.
I use a cell phone provided by the company. I work on the opposite side of the country from my corporate office, and my main contact is on the same calling plane so phone to phone is no extra charge (i.e. more or less free). Most of the time my cell phone if off - when I'm in the office - and I use the land line.
I use my cell when I travel, and that enables clients or my colleagues to contact me wherever I happen to be. Evenso, most of the time it is turned off.
As for body language, I've seen people being very expressive while using a cell phone. Once while waiting to board a plane, some guy waiting at the gate was pacing back and forth, waving his arms and yelling into his cell phone. I think he was talking to his lawyer about his divorce.

And I've seen people just yacking away about gossip.
If I don't have a mobile phone in twenty years? I will not have one because I believe they sap your ability to communicate and they are a jump backwards not forwards. And what's more I think I could make a pretty good case that most people have them merely to appear in with the crowd and do not actually need them, they are little more than a fashion statement to be frank.
Certainly the type of phone and the way one wears it could be a fashion statement for some. I carry mine in my pocket.
Au contraire, I believe people with mobiles are slowly removing themselves from real communication, and being left behind socially.
I do prefer face-to-face meetings with clients and colleagues. I just returned from several days of technical meetings in which I met with a number of people from one organization.
The next best medium to an in-person meeting is webcasting, and I will be do that next week concerning a big project on which I'm working. We'll be using phone and internet to present overview and status to people distributed across the US and Europe.
Evo and chroot make several good points. I have used my cell in an emergency and otherwise, when on the road. It's especially useful when trying to rendezvous with someone out in the field and away from a land-line.
As for the OP, I find 'ringtones' to be rather obnoxious, especially when the volume is turned up so that everyone around can hear it. As chroot mentioned, the fidelity is horrible. I have my phone on the vibration (quiet) mode so that I can sense it, and it doesn't impact anyone around me.