PHS can be changed into Tong Ling. What is the difference after the change? I wonder if I can surf the internet after I change it?

First of all: the operators are different. Da Lingtong: China Unicom (formerly China Netcom)

PHS: China's telecommunications technology is different;

PHS: PHS wireless local telephone technology originated in Japan, which makes the traditional fixed telephone no longer fixed in a certain position, and can be used freely within the coverage of wireless network, answering and making local, domestic and international calls anytime and anywhere. PHS has been on the edge of China policy for a long time, and is called "the supplement and development of fixed telephone". The wireless local telephone represented by PHS is a good choice to solve the application in a certain period. Da Tong Ling: Initially, CDMA450 was developed to upgrade the NMT450 analog mobile communication system widely used in Eastern Europe and Northern Europe to a digital mobile communication system supporting multimedia applications. Moreover, CDMA450 technology itself has the characteristics of low frequency, wide coverage, good indoor penetration coverage, large capacity and support for wireless high-speed packet data services. Another important advantage is that its investment cost can still be kept at a low level in the case of large coverage and low user density.

200 1, ITU-D Group 7 through a series of technical comparison and scheme demonstration, finally found that CDMA450 scheme is the best choice to solve the communication in decentralized areas.

Compared with CDMA800/ 1900, CDMA450 only replaces the RF module, and there is no essential difference in technology, and the price is almost the same. But the difference is that the coverage area of each base station of CDMA450 far exceeds that of PHS and CDMA2000. Theoretically, the number of base stations required for CDMA450 is 1/6- 1/8 of that for high frequency (above/500mhz) systems.

Technically, the evolution from CDMA450 to 1XRTT, EV-DO and even EV-DV is a clear 3G evolution path.

"Dalingtong" is a fixed telephone service with SCDMA wireless technology as access means.

SCDMA is a synchronous code division multiple access wireless access system, which is the third generation wireless communication technology with the same core as TD-SCDMA technology. It has the advantages of small radiation, good confidentiality and high communication quality. "Dalingtong" supports a variety of new business functions such as caller ID, call forwarding, SMS, data and so on.

In addition to all the functions of wireless local calls, SCDMA has the following advantages:

Security is one of the biggest advantages of SCDMA system. It is said that SCDMA is a spread spectrum communication system, and its unique smart antenna beam greatly improves the anti-eavesdropping performance. As SCDMA has completely independent intellectual property rights, security measures can be added according to the requirements of government security departments, thus solving the problem of telephone eavesdropping.

The call quality is good. The voice quality of SCDMA "Dalingtong" is comparable to that of fixed line when it is stationary, and comparable to that of GSM mobile phone when it is moving. Normal calls can still be made when the speed in the urban area reaches100km, and calls cannot be dropped when the speed in the suburbs reaches120km. The success rate of call switching of SCDMA "Dalingtong" is over 95%.

The base station coverage of Dalingtong is 4000 meters, which is far greater than the 500-meter target of PHS. The increase of base station coverage radius obviously brings two benefits: first, the number of handovers between base stations is greatly reduced, users do not need to rotate frequently in different base stations during the mobile process, and the phenomenon of dropped calls similar to PHS will be greatly reduced; Secondly, the number of base stations needed to cover cities is greatly reduced, thus alleviating the cost pressure of huge network construction projects. For example, the deployment of PHS system in Beijing requires more than 10,000 PHS base stations, while Dalingtong only needs 500, which reduces the network construction cost by one third.

In addition, in addition to the shortcomings of poor PHS signal and poor call effect, Dalingtong also has the characteristics of good signal, not easy to drop, and normal call in high-speed mobile. In order to achieve these effects, Dalingtong system combines advanced technologies such as smart antenna, synchronous code division multiple access, software radio and full-quality speech compression coding, and technically surpasses PHS system.

In addition to providing you with new services such as well-informed incoming calls, caller ID, call forwarding, one-number call, IP long distance, etc., Dalingtong also provides short message exchange services. Comparison between Dalingtong and PHS: PHS will quit the communication market!

The purpose of PHS clearing frequency and quitting network is not to cause harmful interference to TD-SCDMA system in 1880- 1900MHz frequency band. Previously, the government authorities had approved China Mobile to use 1880- 1900MHz and 20 10-20 15MHz for TD-SCDMA network construction.

It is beneficial to TD network optimization and the growth of mobile phone sales. Some mobile phone manufacturers believe that the current PHS frequency band has some interference with TD-SCDMA system, and quitting the network can solve this problem. During the three-year transition period, a large number of PHS users will gradually update to 3G or 2G mobile terminal devices, which is undoubtedly a driving force for the depressed mobile phone market affected by the financial crisis. Great Tong Ling continues to serve the people! Dalingtong has officially approved frequency bands. After the exposure of the document that the Ministry of Industry and Information Technology asked PHS to withdraw from the market, it also triggered a controversy over Dalingtong. On the surface, there is only one word difference between Dalingtong and PHS, but many users are also worried that Dalingtong will withdraw from the market like PHS. For this kind of unfavorable guidance, China Unicom fully countered and clarified it. China Unicom said that the relevant notice of the Ministry of Industry and Information Technology on clearing the frequency and quitting the network was put forward for the 1900- 1920MHz band, that is, the relevant telecom operators were required to complete11before the end of 201. The frequency band used by Unicom's Dalingtong service is 1785- 1805MHz, which was officially approved by the former Ministry of Information Industry and the State Construction Committee, and is not within the scope of this frequency clearing and network withdrawal. Unicom said that Dalingtong is an extension of the fixed-line service of SCDMA mobile communication technology, and the frequency band it uses is specially used by the country for SCDMA equipment, and the frequency band it occupies does not conflict with the 3G channel designated by ITU. Therefore, China Unicom will, as always, provide quality services for well-informed customers. 3G license has no influence on Dalingtong, which is quite different from PHS. The former is SCDMA technology and the latter is PHS technology. At present, Dalingtong has been widely used in China Unicom, a southern province. At present, Dalingtong has been widely used in more than 20 provinces and cities in Guangxi, Sichuan, Shaanxi, Gansu and more than 30 foreign countries such as Sri Lanka, Mongolia and South Africa. What impact does 3G license have on the development of Dalingtong? China Unicom said: Most people choose Dalingtong mainly because it is affordable and can be used as a substitute for fixed line. After the issuance of 3G licenses, operators have invested a lot of money in 3G, but this does not affect the operators' attention to the existing market. Take Guangxi as an example. At present, the telephone penetration rate is only 52%, which is lower than the national average. The diversification and individualization of consumers' communication needs leave a lot of room for the development of Dalingtong, so the issuance of 3G licenses will not have a great impact on Dalingtong. In addition, Dalingtong adopts the only 3G(TD-SCDMA) core technology with independent intellectual property rights in China, which has many functions and features, can be continuously improved and upgraded independently, and has many advantages such as good signal coverage, rapid decline, environmental protection and low radiation. Its call quality can be comparable to that of mobile phones, and the tariff is more affordable. In addition, there is a unique "one call and two rings" function, which allows the well-informed mobile phone to ring while dialing, and can answer at will, even if it is on a business trip, it will not miss a call. Dalingtong is suitable for China's national conditions. China Unicom emphasizes that Dalingtong has low investment in building and maintaining the station, which can provide more affordable tariffs for our customers. Therefore, it can be said that Dalingtong's products have adapted to the basic national conditions of China and the vast number of developing countries in the world, especially the tariffs of Dalingtong still have obvious advantages. The local call charges of some packages of Dalingtong are equivalent to only 1 cent per minute. Moreover, the current service bundling package obviously has great tariff advantages, that is, bundling a mobile phone number and a big smart number to realize the preferential complementarity of communication tariffs; Moreover, pregnant women and the elderly have extremely low radiation when using Dalingtong, which avoids the phenomenon of dizziness and brain swelling when using mobile phones, and is environmentally friendly and healthy; Business salespeople often need to contact customers by telephone, which can save a lot of telephone bills every month; As an office phone, Dalingtong can answer it at will, get rid of the shackles of fixed telephone lines and improve office efficiency. China Unicom said that the Ministry of Information Industry has regarded Dalingtong as a solution for rural and sparsely populated remote areas to enjoy universal telecommunications services, which is beneficial to rural users. The merger of Unicom and Netcom has no influence on Dalingtong, which is the business product of the original Netcom. China Unicom said that after the merger of Unicom and Netcom, the service to well-informed users will not be affected. Unicom said that in June 5438+1October 65438+May, 2008, Unicom and Netcom successfully merged. After the merger, the new Unicom will have richer physical service channels, denser distribution of business outlets, more reasonable layout of business halls and more convenient business services, which will make Dalingtong's services more convenient.