Notes on CMCC (China Mobile), CU (Unicom), CT (Chinese telecom)

one or three major carrier networks

CMCC (chinamobilecommunicationcorporation): GSM (2G), TD-SCDMA (3G), Td-lte (4G);

CU (China Unicom): GSM (2G), WCDMA (3G), Fd-lte+td-lte (4G);

CT (China Telecom): cdma1x (2G), CDMA2000 (3G), Fd-lte+td-lte (4G);

second, call and use the traffic is a net? (GSM can be high-speed internet?) )

GSM belongs to 2G technology, and generally speaking 2G network Internet should refer to GPRS

(1) About GSM:

1). Because the frequency of GSM is mostly in 900Hz, frequency is too low, still and with long distance low speed call;

2). GSM speed is too low, so that can not be real-time online, on time charges, according to traffic charges;

2). GSM is a 2.0G technology, although the signal is stable, but because it is also a large number of networks in one of the earlier version, can not do like 3G, 4G high-speed internet

(2) About 2G, 3G, 4G Internet:

is an example of the Unicom network:

　　

1-generation mobile network refers to the original analog, voice-only cellular phone

2 Generation mobile phone network is GSM phone screen display @

2.5 Generation mobile phone network is GPRS mobile phone screen display G

2.75 Generation Network is the Edge phone screen display E

　　3 Generation mobile phone network China becomes three. Telecom Mobile Unicom Telecom 3G mobile phone display signal lattice edge and data connection indication are 3G mobile unicom signal lattice plus indicates that 3G has a data connection after the instruction from 3G to H (Unicom mobile phone display to + + on behalf of 3.5G)

　　4 Generation mobile network China divided into two major categories Td-lte Fdd-lte

Notes on CMCC (China Mobile), CU (Unicom), CT (Chinese telecom)