Initially, This Access

Initially, this access takes place via personal computers equipped with modems, and using as a means of transmission lines used by the copper telephone. This allows the structure of communications and implemented by telephone companies. The first ISP only provides a closed network with multiple services (Anoticias, chat, online games), however until the advent of Netscape was not possible to navigate away from these networks, although it was optional.
However, the development of technology has enabled Internet access can be made from a wide range of devices. Mobile phones, PDAs, PCs (laptops and common) and the use of wireless data transmission (GSM, WAP, GPRS, 3G, HSDPA, Wifi, etc).
Therefore, ISPs have had to adapt to the needs of mobile life, and the challenge it poses tecnologico. But besides the telephone connections and wireless Internet access is also offered through the lines and cable television transmissions of the new digital terrestrial television (DTT).
They even offer services (even in testing) that give access to the Internet via the electrical network, known by the acronym PLC.