Different lines of cell phones

Nokia
Nokia is a multinational company and is the second mobile phone manufacturer in the world and one of the leading companies in the telecommunications sector. Headquartered in Espoo Keilaniemi (Finland), Nokia is one of the best known brands within and outside the European Union.
Sony Ericsson
Sony Mobile Communications (formerly Sony Ericsson Communications AB) is a joint venture (JV) formed by the Swedish company Ericsson and the Japanese company Sony, which manufactures mobile phones and accessories.
Nextel
Nextel is the most effective integrated mobile communication system for people working in a team, since meet in a single mobile terminal, Direct Connect services individually or in groups (two-way digital radio), mobile telephony, paging and transmission mobile data, with the best cost / benefit existing on the market today.
Blackberry
BlackBerry is a line of smart phones (better known as smartphones in English) developed by the Canadian company Research In Motion (RIM) that integrates mobile email service, but includes typical applications of a smartphone: Address Book, Calendar , task lists, notepad etc. as well as telephone capabilities on newer models. It is primarily known for its QWERTY keyboard, and its ability to send and receive Internet e-mail by accessing the networks of cellular phone companies that offer this service. The term "blackberry" is also commonly used to refer to any mobile phone that incorporates a full keyboard.

Introduction

A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device that can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. By contrast, a cordless telephone is used only within the short range of a single, private base station.

Cell phone companies

Claro:
Claro Argentina is a mobile phone company, owned by Mexico's America Movil, which operates mobile phone services in that country. Born in March 2008, replacing the trademark CTI Movil, which had been acquired by America Movil in 2003.

Personal:
Telecom Argentina is an Argentina-based company telecommunications. Commenced operations on November 8, 1990 when the Argentine government, through international competitive bidding, awarded the telecommunications system in the northern region to Nortel Inversora SA (Nortel).

Movistar:
Movistar is a major Spanish mobile phone operator owned by Telefónica S.A.. It operates in Spain and in many Latin American countries. It is the largest carrier in Spain with 22 million customers (cellphone services only) and 41.58% of market share.2 Its principal competitor in Latin America is America Movil. It offers GSM 900/1800 MHz (2G), UMTS 850 & 1900 MHz (3G) and HSDPA (3.5G) services.