At the time old, when you were in the street and to precisavafalar with somebody in urgency, its better option was to look some orelho and desejarque the person was not is of house or the office. Therefore, comprarcelulares was raroque, in contrast, was very common that the mantivessemlistas people of the telephones where they could find the contacts most important. Nowadays this can seem a muitodistante past, but, in the truth, it makes less than ten years. Two things that had changed nesseperodo, and had finished catalizando all the other changes that we had in matriade communication and relationship, are the cellular telephones and the Internet. The cellular ones had had a more humble beginning, servindoapenas as a system of mobile telephony, based in the transmission for radio. Onome ' ' celular' ' it comes of the form as the nets of the soorganizadas operators. Instead of an only great station of transmission for city, some lesser stations are used, that divide the city in small areas, called of cells, each one with (typically) of 10 the 30 km. The use demltiplas stations allows to increase the available line number (since, had to the limit of available frequencies, each station makes use of apenasalgumas hundreds of canals) e, at the same time, allows they aparelhostrabalhem that them with a transmission power much more low, what it increases aautonomia of the batteries and it reduces the emission of harmful radiation.

The first generation of devices used a simple sistemamuito, with analogical signal and a system of identification that could serfacilmente copied and reproduced. With the development each bigger time nasnovas technologies, the cellular ones had left of being only portable telephones to paracomearem the long evolutivo process, until if becoming smartphones. As they had been evolving, the cellular ones had started to incorporate funesde each time more devices, becoming gradually more important. That is, they possess a power of superior processing to the one of much PCs of finalda decade of 1990. With as much power of available fire, people fazemdownloads for cellular, and is not of if finding odd that they have passadoa to assimilate the functions of other devices, as well as in the case of the PCs.