Telgam
Mobile (phone) or mobile phones (telgam) or mobile (HP) or also referred to the electronic telecommunications devices that have the same basic capabilities with conventional phone lines fixed, but can be taken anywhere (portable, mobile) and unnecessary connected with the telephone network using a wired (wireless; wireless).
Currently Indonesia has two systems of wireless telephone network GSM (Global System for Mobile Telecommunications) system and CDMA (Code Division Multiple Access).
History
The inventor of the first mobile phone system is Martin Cooper, a Motorola employee on April 3, 1973, although many so-called inventor of the mobile phone is a team from a division of Motorola (the division where Cooper worked) with the first model is the DynaTAC. The idea is triggered by Cooper is a communication tool that small and easily carried in a flexible traveling.
Cooper and his team face the challenge of how to include all electronic materials into small-sized tools for the first time. But eventually a first mobile phone was successfully completed with a total weight of weighing two kilograms. To produce it, Motorola will cost the equivalent of U.S. $ 1 million. "In 1983, the portable cell phone worth U.S. $ 4 thousand (Rp36 million), equivalent to U.S. $ 10 thousand (Rp90 million).
Having succeeded in producing mobile phones, the next biggest challenge is to adapt the infrastructure to support the mobile telephone communication system by creating a network system that requires only a 3 MHz spectrum, equivalent to five TV channels are channeled to the world.
Another figure who is known to be instrumental in the world of mobile communications is Amos Joel Jr., who was born in Philadelphia, March 12, 1918, he was recognized worldwide as an expert in the field of switching. He got a bachelor's degree (1940) and master (1942) in electronic engineering from MIT. Not long after the study, he began his career for 43 years (from July 1940-March 1983) at Bell Telephone Laboratories, where he received more than 70 U.S. patents in the field of telecommunications, particularly in the field of switching. Amos E Joel Jr., making a connector system (switching) from one region of the cell phone to another cell region. Switching this should work when mobile users move or move from one cell to another cell so that the conversation is not interrupted. Since the discovery of Amos Joel is the use of mobile phones to be comfortable.
Functions and features
In addition to working to make and receive phone calls, mobile phones are generally also has the function of sending and receiving short messages (short message service, SMS). There is also a mobile phone service providers in some countries that provide third generation services (3G) services by adding a videophone, as a means of payment, as well as to televisions online on their mobile phone. Now, mobile phones into multifunctional gadgets. Following the development of digital technology, now mobile phones are also equipped with a wide selection of features, such as can capture radio and television broadcasts, software audio players (MP3) and video, digital cameras, gaming, and internet services (WAP, GPRS, 3G). In addition to these features, the phone now has embedded computer features. So on the phone, people can change the functions of mobile phones into mini computers. In the business world, this feature is very helpful for business people to do all the work in one place and makes the job completed in a short time.
Today, the role of mobile phones has become a Primary Day-to-day needs, the following categories of phones based on function:

Business phone phone type is intended for those of you who want a business device in your hand, usually have a phone that has this ability quite smart phones "smartphones". Beragai business applications included in this phone and can make your office work can be seen and done in a mobile phone.
Mobile Phone Mobile Entertainment is a type mobile multimedia type, where all activities related to music, art, photos, and other social can you cope with a cell phone. Many of the phones of this type that has its own variant, such as Mobile Music, Mobile Camera, Mobile Internet and Social Affairs.
Mobile phones Fashion phones of this type are more reliant on its looks, and can make the owner very happy though with the features that impressed "potluck". But behind it all, a fashion phone can cost many times the price of advanced mobile phones. Today can be found phones that cost more than the price of a vehicle even more expensive than the price of a house.
Standard Mobile cell phone type is intended for those of you who want a phone that is simple, features that are embedded in the phone is a core feature, without the new technology embedded.