China Telecom uses digital currency
Publish: 2021-04-20 00:00:51
1. At present, the 2G standard of China Unicom and China Mobile is GSM, while that of China Telecom is CDMA. GSM and CDMA are not compatible with each other, and roaming between networks can not be realized, which can not meet the needs of global communication. It is driven by the business demand that the 2.5G technology, represented by GPRS, emerges. As the transition from the second generation mobile communication to the third generation mobile communication, the 2.5G technology is emerging
PHS personal handy phone system is the supplement and extension of fixed network, also known as wireless local telephone, commonly known as "PHS"
at present, the 2G network standard used by China Mobile and China Unicom is GSM, so there is no better one. The standard is the same, and the speed is the same, but in different places, the network speed or signal is sometimes affected by the environment
now China Unicom mobile telecom has launched 3G network communication. China Unicom uses the world's most mature and widely covered WCDMA network, with the fastest and most stable network speed, and the strongest universality in the world
China Mobile uses TD-SCDMA network technology independently developed in China. Although it has strong autonomy, it is still in the development stage, and has certain limitations in maturity, stability, network speed and universality
the CDMA2000 network technology used by China Telecom is the predecessor of WCDMA, which is also a transitional development mode. It has some characteristics of WCDMA. Because of this, CDMA2000 is between the former two in the 3G services of the three major operators. Its network speed, stability and versatility are slightly worse than WCDMA, but slightly better than TD-SCDMA
so 3G services, network speed: Unicom > Telecom > mobile; Stability: Unicom > Telecom > mobile; Global universality: Unicom > Telecom > mobile.
PHS personal handy phone system is the supplement and extension of fixed network, also known as wireless local telephone, commonly known as "PHS"
at present, the 2G network standard used by China Mobile and China Unicom is GSM, so there is no better one. The standard is the same, and the speed is the same, but in different places, the network speed or signal is sometimes affected by the environment
now China Unicom mobile telecom has launched 3G network communication. China Unicom uses the world's most mature and widely covered WCDMA network, with the fastest and most stable network speed, and the strongest universality in the world
China Mobile uses TD-SCDMA network technology independently developed in China. Although it has strong autonomy, it is still in the development stage, and has certain limitations in maturity, stability, network speed and universality
the CDMA2000 network technology used by China Telecom is the predecessor of WCDMA, which is also a transitional development mode. It has some characteristics of WCDMA. Because of this, CDMA2000 is between the former two in the 3G services of the three major operators. Its network speed, stability and versatility are slightly worse than WCDMA, but slightly better than TD-SCDMA
so 3G services, network speed: Unicom > Telecom > mobile; Stability: Unicom > Telecom > mobile; Global universality: Unicom > Telecom > mobile.
2. Does China Mobile have WCDMA? The simplest and most direct answer is: No
however, this kind of answer failed to improve the questioner's knowledge. Instead, there were more new questions. Let's make a comprehensive understanding of "why does China Mobile have WCDMA
1. What is WCDMA
WCDMA is the abbreviation of "wideband code division multiple access" (English: wideband code division multiple access, often abbreviated as W-CDMA) is a 3G cellular network, and some protocols used are consistent with 2G GSM standard. WCDMA mainly originated from the early 3G Wireless Research in Europe and Japan around the 1990s. As an emerging technology, WCDMA is also derived from the practice and application of CDMA technology. ITU finally accepted W-CDMA as a part of imt-20003g standard, and its commercial time was at the beginning of this century, starting from Japan
WCDMA is rapidly sweeping the world and has occupied 80% of the wireless market. As of 2013, the number of WCDMA users in the world has exceeded 3.6 billion, and 156 operators in 170 countries have commercialized 3G WCDMA services
2. Which telecom operator is China's commercial 3G WCDMA service
Japan began commercial WCDMA-FDD around July 2001, and China and Europe plan commercial WCDMA around 2002. Since May 17, 2009, China Unicom has provided W-CDMA services in Chinese mainland and started to provide HSPA services (HSPA+ services are also provided in some areas).
3. Which communication network services are used by China mobile operators
the full name of CMCC is "China Mobile Communications Corporation", which is established on April 20, 2000 by China Mobile Communications Corporation (CMCC). CMCC is a mobile communication operator based on GSM, TD-SCDMA and TD-LTE standard network
4. Summary
W-CDMA is the 3G service communication network operated by China Unicom
TD-SCDMA is the 3G service communication network operated by China Mobile
CDMA2000 is the 3G service communication network operated by China Telecom
China's three major telecom operators operate their own 3G services and do not infringe on each other, but they cooperate with each other to realize the interconnection of the three networks, only there are subtle differences in the charges of various business operations between "inside the network" and "outside the network".
however, this kind of answer failed to improve the questioner's knowledge. Instead, there were more new questions. Let's make a comprehensive understanding of "why does China Mobile have WCDMA
1. What is WCDMA
WCDMA is the abbreviation of "wideband code division multiple access" (English: wideband code division multiple access, often abbreviated as W-CDMA) is a 3G cellular network, and some protocols used are consistent with 2G GSM standard. WCDMA mainly originated from the early 3G Wireless Research in Europe and Japan around the 1990s. As an emerging technology, WCDMA is also derived from the practice and application of CDMA technology. ITU finally accepted W-CDMA as a part of imt-20003g standard, and its commercial time was at the beginning of this century, starting from Japan
WCDMA is rapidly sweeping the world and has occupied 80% of the wireless market. As of 2013, the number of WCDMA users in the world has exceeded 3.6 billion, and 156 operators in 170 countries have commercialized 3G WCDMA services
2. Which telecom operator is China's commercial 3G WCDMA service
Japan began commercial WCDMA-FDD around July 2001, and China and Europe plan commercial WCDMA around 2002. Since May 17, 2009, China Unicom has provided W-CDMA services in Chinese mainland and started to provide HSPA services (HSPA+ services are also provided in some areas).
3. Which communication network services are used by China mobile operators
the full name of CMCC is "China Mobile Communications Corporation", which is established on April 20, 2000 by China Mobile Communications Corporation (CMCC). CMCC is a mobile communication operator based on GSM, TD-SCDMA and TD-LTE standard network
4. Summary
W-CDMA is the 3G service communication network operated by China Unicom
TD-SCDMA is the 3G service communication network operated by China Mobile
CDMA2000 is the 3G service communication network operated by China Telecom
China's three major telecom operators operate their own 3G services and do not infringe on each other, but they cooperate with each other to realize the interconnection of the three networks, only there are subtle differences in the charges of various business operations between "inside the network" and "outside the network".
3. GSM and CDMA represent two different network modes. In the mainland, GSM network mode is adopted by China Mobile, while CDMA belongs to China Telecom. Now the city telecom operators like to monopolize. If your iPhone4 is GSM network, you can only use the mobile number card. If it is CDMA version, you can only use GSM network, In China, you can only use the number card of Telecom. If your Hong Kong version can support GSM and CDMA at the same time, then g / C can be used. Although the number of iPhone can be written on the market now, I don't think it's necessary. I'd better buy the Hong Kong version directly
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