Development

Generation 0

The history of the discovery of cell phones can not be separated from the development of radio. Early discovery of cell phones began in 1921 when the Detroit Police Department Michigan tried to use a car phone in one direction. Then, in 1928 the Detroit Police Department began using one-way radio communication on all regular patrol car with a frequency of 2 MHz. on subsequent developments, radio evolved into a two-way communication with''''frequency modulated (FM).
In 1940, Galvin Manufactory Corporation (now Motorola) to develop portable Handle-Talkie SCR536, which means a communication tool on the battlefield during World War II. This period is the generation of cellular phone 0 or 0-G, where mobile phones were introduced.

After removing the SCR536, then in 1943 Galvin Manufactory Corporation issued a return partable first FM two-way radio that is named with the SCR300 backpack model for U.S. army This tool weighs about 35 pounds and can work effectively within the operating range of 10 to 20 miles.

System 0-G mobile phones still use the VHF radio system for connecting the phone directly on PSTNlandline. The weakness of this system is the problem of congestion on the network which then led to attempts to replace these systems.
Generation 0 is terminated with the invention of the modern concept by engineers from Bell Labs in 1947. They found the concept of using a phone as a basic hexagonal cell phone. However, this new concept was developed in the 1960s.

Generation I

The first generation cell phone is also called 1G. 1-G is the first real mobile phone. In 1973, Martin Cooper of Motorola Corp. cell phones first discovered and introduced to the public on April 3, 1973. Cellular phones were found by Cooper weighs 30 ounces or about 800 grams. This discovery has changed the world forever. The technology used 1-G is still analog and is known as AMPS. 

AMPS uses frequency between 825 MHz-894 MHz and operated at Band800 Mhz. Because it is analog, then the system used is still regional. One drawback is the generation of 1-G because the size is too large to be held by hand. Large size is due to the purposes of power and poor battery performance. Besides the generation 1-G still has problems with mobility users. When making a call, the user mobility is limited to coverage area of ​​mobile phones.

Generation II

The second generation or 2-G appeared around 1990's. 2G in the U.S. already use CDMA technology, whereas in Europe uses GSM technology. Using the standard GSM frequency 900 Mhz and 1800 Mhz frequencies. With these frequencies, GSM has a larger customer capacity. In 2G generation analog signals are replaced with digital signals. The use of digital signal equip mobile phones with voice mail, call waiting, and SMS.

A cellular phone in this generation also has a smaller size and lighter due to the use of digital chip technology. The smaller size is also due to the need for a smaller battery. The advantages of generation 2G is the size and weight of the smaller and lower radio signals, thus reducing the membayakan efekradiasi users.

Generation III

This generation is also called 3G that enables network operators to give their users a wider range, including the internet as well as high tech video calls. In 3G there are 3 standard for the world of telecommunications is Enhance Datarates for GSM Evolution (EDGE), Wideband-CDMA, and CDMA 2000.

The downside of the 3G generation is a relatively higher cost, and lack of network coverage because of this technology is still new. But interestingly in this generation is to start the inclusion of the operating system on mobile phones, making mobile phones increasingly feature even close to full PC functionality. The operating system used, among others, Symbian, Android and Windows Mobile

Generation IV

This generation is also called Fourth Generation (4G). 4G is a mobile system that offers new approaches and solutions that integrate wireless technology infrastructure that already exist, including wireless broadband (WiBro), 802.16e, CDMA, wireless LAN, Bluetooth, and others. 4G systems based on the heterogeneity of IP networks that allow users to use multiple systems anytime and anywhere.

4G also provides its users high-speed, high volume, good quality, global reach, and flexibility to explore a variety of different technologies. Finally, 4G provides fast data delivery service to accommodate a variety of applications such as multimedia, video conferencing, online gaming, and others.