History of Mobile Phones | 2.5G Network | What's Inside A Mobile Phone

In the history of communications technology, Martin Cooper pioneered the cellular telephony technology and that is why he was considered as “the father of mobile telephony”. Mr. Cooper introduced the 1^st mobile in 1973 in USA while working for the famous Motorola company, but it was not until 1979 when the first commercial cellular system was introduced in Tokyo, Japan by NTT. It was in 1981 when the Nordic countries introduced a mobile system similar to Advanced Mobile Phone System (AMPS). Side by side in 1983, United States adopted the rules for creating the first commercial cellular system that was put into operation for the first time in the city of Chicago. This step by US served as a starting point for the spread of mobile technology in several countries around the world. This system was then used as an alternative to conventional wireless telephony. The latest mobile technology was widely accepted by all the countries and within a few years, there were millions of people who began using this system. After this, there began the need to develop and implement other forms of multiple access channels and transform the analog signal to digital in order to make space for more and more users that were increasing at a rapid rate. Now in order to separate one from other stage, mobile telephony has been characterized by having different generations namely 1G, 2G, 2.5G, 3G and now 4G and 5G. I have already described 1G, 2G, and 3G in my previous hub, Cell Phone Generations - Advantage of 3G network over 1G and 2G but in between the generation of 2G and 3G, there was a generation which I forgot to mention and that was 2.5G which is very important for the understanding of mobile phone generations so here it is: