Evolution of Mobile phones

The evolution of the Mobile phone began in 1973, Martin Cooper developed the cell phone and he is the first person to have a conversation on the first mobile phone. It weighed 1.1 kg, 23 cm in length, 4.45 cm in width and 13 cm in depth.

In 1990s, IBM Simon was the world's first smartphone that had multiple capabilities such as phone, pager, fax machine, PDA and a QWERTY keyboard. 

Mobile Standards

CDMA (Code Division Multiple Access) is the dominant network standard in North America. Sprint and Verizon are the two companies that uses CDMA. Also, CDMA are used in Japan and South Korea. It offers features such as faster data download speeds using EVDO Technology. Thus, the faster download speeds helps during mobile web browsing or watching and downloading television programs.

GSM (Global System for Mobile Communication) is the most common standard of mobile phones in the world. It is a set of ETSI standards specifying the infrastructure for a digital cellular service. 

In 1991, first GSM Network launched. Then, in 1992, most European GSM Networks turn commercial. In 1994, data transmission capabilities launched and 1997, 200 GSM Networks in 109 countries.

It uses features like SIM (Subscriber Identity Module) that enables users to retain information after changing handsets as the SIM is portable. Over 95% of the worlds cellular market uses the GSM platform such as Europe, Japan and Australia. 

The GSM network can be divided into 4 main parts as follows:

• The Mobile Station (MS).
• The Base Station Subsystem (BSS).
• The Network and Switching Subsystem (NSS).
• The Operation and Support Subsystem (OSS).