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I mean what if you work and your boss has to contact you? They can't expect you to be home and call your house or dorm number.
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Then they leave a message and you call them back when you get it.
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My Dad has lived across the country since I was 10 - I fly to visit him regularly. If I didn't have a cell phone there would have been countless times when I would never have found him.
I think we can call it a 'need' when a 12 year old is wandering around looking for her father in an unknown cities airport all alone.
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Flying as an unaccompanied minor should mean there is someone on the airline staff who will take care of you the whole time. Also, your dad says where he will be when you land, and you go find him. If you don't know how to get there, you ask security or airline personnel... it's not that complicated.
Are cell phones useful? Yes. Are they necessary? No. Same with the other things. I don't answer my cell phone unless the number is in my phonebook. Furthermore, if I don't want to talk to whoever calls that is in my phone book, I don't answer. The cell phone is for MY use. It is not for everyone else to contact me 24/7 when I would rather be doing something else.
Also, regarding facebook, a lot of people, at my school at least, use it to create events / parties and such and let people know about them.