All-Netcom mobile phones are "six-mode all-Netcom mobile phones", which means that the mobile phone supports six mobile communication standards of China Telecom, China Mobile and China Unicom, including TD-LTE, FDD-LTE, TD - Six-mode single and dual-SIM mobile phone terminals for SCDMA, CDMA (EVDO, 2000), WCDMA, and GSM (GPRS). For five-mode terminal products that do not support the CDMA (EVDO) standard, it can meet the needs of more than 70% of domestic users and can be considered a "quasi-full Netcom mobile phone" [1-2]

This mobile phone has one or two settings There are three card slots, which can support cards from three domestic operators, and the primary and secondary cards can be selected for 4G.

China has three operators, and China Mobile operates a TD technology network with our country's independent patents, so our country's mobile phone network system is quite complicated. So today, let us know something about the network standards of the three major operators.

CHINA MOBILE?

The 2013 annual performance report released by China Mobile showed that its operating income was 630.2 billion yuan and the total number of users reached 767 million. The well-known Mobile Phone, the world's largest operator, has become a well-deserved giant with its accumulation and good reputation in the 2G era. However, in the 3G era, due to problems such as lack of chip support and slow network construction, it was once thought that it would decline. However, in the 4G era, the Ministry of Industry and Information Technology provided the best TDD frequency band with strong financial support. Chips also began to be shipped in large quantities, and terminals also Gradually enriched, so in the next few years, China Mobile's status will still be untouchable. ?

2G network: GSM ? (band 2/3/8)

3G network: TD_SCDMA? (band 34/39)

4G network: TD_LTE ? (band 38/39/40)

China Unicom (CHINA UNICOM)?

As of December 31, 2013, China Unicom had operating income of 295.04 billion yuan and 284 million employees. user. In the 2G era, we once operated a CDMA network, but later sold it to China Telecom and built a GSM network. It was also GSM. Compared with China Mobile, there was a big experience gap. The number of users was greatly increased by China Mobile. However, in 3G, we got The internationally accepted WCDMA thought it could catch up with China Mobile. Unexpectedly, there were abundant terminals. However, network construction lagged behind and the user experience was not good. It still failed to catch up. In the 4G era, it obtained dual 4G licenses.

2G network: GSM? (band 2/3/8)

3G network: WCDMA (band 1/3)

4G network: TDD_LTE? ( band 40/41 )FDD_LTE (band 1/3)

China Telecom (CHINA TELECOM)?

China Telecom announced that in 2013, its performance operating income was 284.149 billion yuan, and mobile users The total number reached 186 million households. It started the latest and is the weakest, but it is very strong in the field of broadband connections. There is a famous saying in mobile phone terminals: Once you enter the telecommunications industry, it will be difficult to buy mobile phones. 2G, 3G, and 4G have no advantages. Come on.

2G network: CDMA 1x? (band 0)

3G network: EVDO/CDMA2000? (band rev.A)

4G network: TD_LTE?( band 40) FDD_LTE (band 1/3)

Summary: GSM is China Mobile and China Unicom’s 2G, TD-SCDMA is China Mobile’s 3G, WCDMA is China Unicom’s 3G, CDMA2000 is China Telecom’s 3G, and TDD-LTE is China Mobile’s 3G , China Telecom, China Unicom 4G, FDD-LTE is another world-wide 4G standard, and it is also the 4G network used by China Unicom and China Telecom.