First & Second Generation Mobile Phones

Mobile phones were born when a number of mobile radio users decided to make mobile phone technology more popular. Mobile telephones were firstly installed in vehicles on a permanent basis, later some versions appeared which were named transportables, could also be carried. Motorola developed a two way radio in a rucksack, the walkie-talkie, and this was widely regarded as one of the first mobiles.

First Generation Phones

First mobile phones are called as first generation (1G) mobile phones. Mobile phones started to gain popularity with the introduction of cellphones that were based on cellular networks.

Mobile phones were originally much bigger than current ones, they were designed for installation in vehicles only, which is called the car phone. These big phones were later converted for use as transportable phones the size of a small.
This system used a single large transmitter on top of a tall building and had a single channel, used for both sending and receiving. To talk, the user had to push a button that enabled the transmitter and disabled the receiver. This system is known as push – to - talk systems.

Second Generation Phones

Second generation, is also called 2G. Second generation telephone systems were different because of their use of digital circuit switched transmission. 2G is the introduction of advanced & quick telephone to network signals. The introduction of 2-G systems saw telephones move from historic 1G telephones to small hand held items, which were much more portable. This change was made useful improvements in technology for example more advanced batteries and energy efficient electronics.

The second generation mobile telephones had several advantages over 1G items. These included SMS messaging, which initially became possible on GSM networks & eventually on all digital networks. SMS text messaging soon became the communication method of choice & the general public now prefer sending messages to placing voice calls.
The first generation of mobile phones was analog; the second generation was digital. The voice signal picked up by the microphone is digitized and compressed.