Top Cell Phones

3G is the 3G network. Refers to the skills of 3G mobile phone network
The smart phone with PDA function generally refers to mobile phone
But because China does not support the 3G network. So the Chinese cell phones are high-priced cell phones with PDA functionality. So people are likely to 3G mobile phone with PDA confused.
3G refers to the 3rd generation mobile communication technology, in Japan the United States has a mature mobile Internet technology, in our country, is under development, 3G mobile phone manufacturers have licensed is the network in preparation. Ministry of Information Industry to qualification to the Unicom network operators, but the number of foreign companies in the competition.
We usually called the 2nd generation GSM mobile network technology – that is 2G, our country is the technology used in most countries of the world of technology. CDMA as a High Performance Low-E high-throughput techniques are as 2nd generation 3rd generation too as the technology-2.5G.
When the 3G era comes, online video conferences, online shopping is no longer a dream, it is the GSM transmission capacity of 100 times. Do not just state it to the interchange of the
Reference: Baidu know

English 3rdGeneration 3G is the abbreviation of the third generation mobile communication technology. Relative first-generation analogue phones (1G) and second-generation GSM, TDMA digital mobile phones, etc. (2G), third-generation mobile phones generally, refers to wireless communications and Internet multimedia communication systems combined with a new generation of mobile communications. It can handle images, music, video streaming and other forms of media services including web browsing, conference calls, e-commerce and other information services. In order to provide this service, wireless network must be able to support different data transfer speed, ie indoor, outdoor, and driving environment can support at least were 2Mbps (megabytes / second), 384kbps (kilobytes / per seconds) and 144kbps transmission speed.
Third-generation mobile phones capable of handling images, music, video streaming and other forms of media services including web browsing, conference calls, e-commerce and other information services. In order to provide this service, wireless network must be able to support different data transfer rate, that is, in the indoor, outdoor, and driving environment can support at least 2 megabytes each / per second, 384 kilobytes / second and 144 kilobytes / second transfer rate.

At present, there are three kinds of standard 3G mobile phone standard: Europe’s WCDMA standard, the CDMA2000 standard, and the United States by the Chinese scientists proposed TD-SCDMA standard.
Now “3G communications,” is about to become a pet phrase of his mouth, then you know what is the 3G communication in the end it? The so-called 3G, in fact, the full name of 3rd Generation, in Chinese meaning is the third generation digital communications. In 1995 came the first generation of digital mobile phones can only make voice calls; appeared in 1996 and 1997 the second generation digital mobile phones will increase the receive data functions, such as receiving e-mail or web page; the third generation of the main difference with the previous two generations is the voice and data transmission speed of the upgrade, it can handle images, music, video streaming and other forms of media services including web browsing, conference calls, e-commerce and other information services. Relative first-generation analogue phones (1G) and second-generation GSM, TDMA digital mobile phones, etc. (2G), [masked advertising]
The name of 3G communication range, the ITU provisions of “IMT-2000″ (International Mobile Telephone 2000) standard, the European telecom giants call him “UMTS” Universal Mobile Telecommunications System. The standard requires that mobile terminal moves to speed, the transmission data rate of 144kbps, outdoor stationary or walking speed was 384kbps, while the interior is 2Mbps. But these requirements do not mean that users can rate can reach 2Mbps, because the room rate will depend on building a detailed frequency planning and organization and close collaboration with the degree operators.

International Telecommunication Union (ITU) to determine the three major 3G wireless communication interface standards are W-CDMA (wideband code division multiple access), CDMA2000 (multi-set wavelength division multiplexing spread spectrum modulation) and TDS-CDMA (time division synchronous code division Multiple Access). W-CDMA standard which mainly originated in Europe and Japan early third-generation wireless research activities, the system in the existing GSM networks to use for system providers, the transition can be less ex situ, the main supporters of the standard Europe, Japan, South Korea. Late last year, the United States, AT & T Mobile Business Group has announced its selection of third-generation WCDMA for their business platform. CDMA2000 system is mainly dominated by the Qualcomm company made in North America, its relatively low construction costs, the main backers, including Japan, South Korea and North America and other regions and countries. TD-SCDMA standard is proposed by China for the first time in this radio transmission technology (RTT) on the basis of international cooperation, the completion of the TD-SCDMA standard, to become a member of CDMA TDD standard, which is a mobile communication industry history, and are the third generation of China’s contribution to the development of mobile communications. In Europe, the United States made their own 3G standard competition, China’s proposed TD-SCDMA 3G standard has officially become one of the world, which indicates that China has entered the mobile communications world leader in the list.

3G mobile communications industry and the computer is completely the integration of industrial product, and the difference compared to the previous phone is great, so more and more people began to call the new mobile communication products such as “personal communications terminal.” Even the communications industry’s most lay people can easily judge the shape on a phone is a “third generation”: the third generation mobile phone has a large color display, or touch-style often. 3G mobile phone in addition to the completion of daily communication outside the high-quality, but also for multimedia communications. 3G mobile phone users can directly write on the touch screen, graphics, and send it to another phone, but the time required may be less than one second. Of course, this information could be transmitted to a computer, or download some information from your computer; users can connect to the Internet using 3G mobile phones, checking e-mail or visit the website; will have many models of 3G mobile phone comes with camera This will allow users to use mobile phones to computers, or even to make digital cameras as a “superfluous.”

3G mobile communications market is experiencing the first generation of simulation technology into the mobile communications business, in the second generation digital mobile communications market was the introduction of the vigorous development of the agenda. In today’s Internet data business continues to heat up, in the fixed access rate (HDSL, ADSL, VDSL) against the background of rising, 3G mobile communication systems have seen the dawn of the market, reinforced by the telecommunications operators, telecommunications equipment manufacturers and the general user attention.

W-CDMA
That WidebandCDMA, also known as CDMADirectSpread, meaning wideband code division multiple access, its supporters are mainly the European GSM system based companies, Japanese companies are more or less involved, including the U.S. and Europe, Ericsson, Alcatel, Nokia, Lucent, Nortel, and Japan’s NTT, Fujitsu, Sharp and other manufacturers. The system can be mounted on the existing GSM network, for system providers, the transition can be lighter shoes, and the GSM systems are quite popular in Asia on the acceptance of this new technology is expected to be quite high. Therefore, W-CDMA has inherent market advantage.
CDMA2000
CDMA2000 is also known as CDMAMulti-Carrier, led by the North American companies made QUALCOMM, Motorola, Lucent and Samsung have subsequently joined the participation of South Korea is now the leader of the standard. The system is derived from the narrowband digital standard CDMAOne out, you can directly from the original CDMAOne structure to upgrade to 3G, construction and low cost. However, the area currently using CDMA only Japan, South Korea and North America, the CDMA2000, W-CDMA more than supporters. However, the R & D CDMA2000 technology is currently the fastest progress in the standards, and many have been the first to launch 3G mobile phone.
TD-SCDMA
The standard was developed by the China 3G standard alone, June 29, 1999, China’s former Ministry of Posts and Telecommunications Science and Technology Research Institute (Datang Telecom) presented to the ITU. The standard intelligent wireless, synchronous CDMA, and software radio technology of today’s leading international financial in which, in the spectrum efficiency, support business flexibility, cost, frequency flexibility and unique advantages. Also, given the huge domestic market, the standard by all the major telecom equipment vendors attention for more than half of the world of equipment manufacturers have announced to support TD-SCDMA standard.