For me, having a new cell phone or a new mp3 is often a want. In fact we don’ t really need to change, for example, from a model number 4 to number 5, because in 2 or 1 year it doesn't change so much. So we are stimulated by other people to buy a new model; the problem is our society, because a lot of people are never happy about what they already have and want always more. But it is the mentality that must change: we buy a new model only if we need a new model! Personally I changed phone 3 years ago because the last one was broken and this was a need.
However the latest technology is also important and used for many jobs, for information,… It is said that the future is in the technology, but I hope that we really need this technology.