The history of the mobile phone is such a remarkable chapter in human’s quest for excellence. Since its beginning, many researches had been made in just a span of about half a century. Man does not stop reinventing and innovating these phones to make life easier, and fitted to individual lifestyle and needs. It has become the most powerful device next only to computers.

In the case of the USA, the account of the mobile phone can be broken down into three different important points. First is the characteristic of the mobile phone from its beginning as a car phone leading to the compact phones we know today. Second is the technology used in adopting radio frequency to send voice signals. Third is the pace of development, from a car phone, to being analog, and to its current digital grandeur.

Let us look into the history of the mobile phone in the aspect of its characteristics.
During the 1940s, mobile phones then were car phones used by police, ambulance services, and trucks. This went on until 1973 when Motorola designed a system that need not be installed in cars. Several years later, the mobile phone system became smaller and more compact.

The technology and the mobile development pace in the history of the mobile phones in the US go side-by-side with these instances. When AT&T through Bell Labs proposed to the Federal Communications Commission (FCC) that a mobile phone system was to be established by placing six cell or base stations in an area with a less powerful central transmitter to insure continuous communication among the users, the commission hesitated. What they did was to allocate limited frequency to be used as solution to the said proposal. Aside from the limited frequency, the technology to be operated on was not available at that time. It was only acted upon after 37 years by giving 800 MHZ. to be implemented by phone companies. The stakeholders themselves caused the delay.

The mobile phone companies meanwhile, continued to improve the technology. AMPS or Advanced Mobile Phone System was invented in the 1980s. This system brought into play the analog technology, equated to a radio transmitter. The drawback of this technology was that it doesn’t enable multiple users at the same time. Signal is also weak and static when the user moves from one place to another.

The analog was then replaced by digital technology in the 1990s. Digitals make possible stronger, clearer signals. It also can handle multiple users.

The mobile technology is divided in to three distinct types, the CDMA, TDMA, and the SMS. These make possible internet browsing and international calls. The United States of America has yet to create further innovations but they have made significant and impressive contribution to the development of mobile phones already.

Currently, mobile phone is still being reinvented to cope with man’s ever changing standard of living. They are slowly being specialized to suit special needs of individuals.

SURVEILLANCE TECHNOLOGY GROUP INC
… or “telephone,” is linked via radio frequencies to base transmitter and receiver stations that connect the user to a conventional telephone network. …
www.survtech.org/home/cellphoneforensics.html

By: David Urmann