看着同事和朋友们手里握着手机神气活现的样子，想起自己在街上因找不着电话而急得团团转的情景，你是不是也在考虑添置一部手机了？或者已经拥有手机的你，对自己那部功能落后的老古董早就心生不满．准备更新换代一下了。先别忙着做决定。在购买一部新手机之前，有必要了解一 Looked at my colleagues and friends holding a cell phone look vivid, think of themselves in the street because they can not find the phone and anxious to turn around the scene, are you also considering adding a cell phone? Or you already have a mobile phone, you are already dissatisfied with your old, obsolete antique. Ready to update it. Do not be the first to make a decision. Before buying a new phone, it is necessary to understand one