The lead.At present mobile phone plays a role in the life of people more and more. Which we may not that the phone becomes key factors of life.The phone is important. People use cell phone to use more because the convenient and access to information on the web sites by using mobile phones and the Internet.In this era of technology communicate over the phone. After the popular and affects every inside present. Make all society to change from the house phone safety phone. Uses the telephone the 1G 2G 2.5G and 2.75G 3G 4G.The 1G (1st Generation) starting from the early system is also the analog system (Analog) and a frequency divider is the small. In this era, we can use the Voice only however. In this era, the user doesn"t need to use the services of other types.The 2G (2nd Generation) due to user needs and a variety of services. The development of transmission of radio waves from an analog to a digital makes the user can use the information in addition to sound service. Make this era became the flourishing of the mobile phone. And because the service data, causing the other services that follow others, whether it is Download Ringtone Wallpaper Graphic. The service in this era, but have some limitations in the speed of data transmission is still at the low.The 2.5G (2.5 Generation) after that period is between 2G 3G and which is 2.5G in this 2.5G is an era with the technology. GPRS (General Packet Radio Service) used to increase the speed of data transmission over the 2G technology GPRS can send data at speeds of up to 115 Kbps. But the speed of the GPRS in practical use is limited to approximately 40 Kbps only, which in the 2.5G that will be the era began to use the service on the part of the information more and more. And text messaging was developed from SMS as MMS mobile phones started to change from black and white screen"s color tones. The is just. Monotone was changed to Polyphonic including True tone as well.Later in the 2.75G is the continuously from the GPRS but are well-trained.
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