Cell phone – not a luxury but a means of communication! Expansion of mobile networks and a steady decline in tariffs and prices for their own phones meant that 'Mobil' can be found not only in a Mercedes successful businessman, but the student in his pocket, even in a bag grandmother pensioner! True, these phones are likely to be different: a businessman – a model of business-class, the student chooses a fashion phone, a lot of pensioners – in economy class. However, the division classes on conditional enough: for example, hit a business-class past, Ericsson R520, now belongs to the budget models, although in terms of functionality it can still give odds to many modern tubes. The market situation is changing very quickly: many new models, old and rapidly becoming cheaper to be discontinued, and mobile operators add new services, which can only be the most advanced phones. Buyer must not only seek an answer to the question: 'How to choose a cell phone? ", But also to determine the operator and tariff plan. Bank of America describes an additional similar source. And it must be done before selecting your phone model: in fact, each operator uses its mobile standard. Let's say you decide to use network services 'Sonnet' – then you need a compatible CDMA-phone, the most common GSM-phones will not work! At present, the cellular market the following standards: GSM, NMT-450i, D-AMPS, CDMA. Basically, if you do not have any special reasons to choose a certain standard – worth looking into GSM, as the most universal and widespread. . Other leaders such as MasterClass offer similar insights.