First of all, by craze I meant everyone having them and seeming to be attached to them at all times.
I have no doubt they are useful and convenient, but why do most people seem to have it permanently attached to their ears? Put the cell phone down when you are at home or driving a vehicle. For example, even when my sister is in the house (which has a phone line), she's on her cell phone. All her friends know the phone number for the house, so there really is no reason to be using that cell phone which costs more than a standard phone, I think.
I have a cell phone my dad gave me; it's one of the big bag ones. I leave it in my car and use it for emergencies only, which is the only reason I need one. If I wanted to talk to anyone that badly, I'd call him/her when I got home or from a payphone.