He is an evolutionary version of cdma800. Both are issued by Qualcomm.
2。 If it's not wcdma, what is it called? - 〉
Wcdma was proposed by 3gpp organization. In order to bypass the new standard of Qualcomm patent, the technical standard is almost the same as cmda2000. Currently Unicom supports it.
Both situations are common, depending on where you are going. Wcdma is widely adopted in Japan.
North America also has AT&T-supported networks. It is also distributed in Europe. But that frequency adopted by each other are not exactly the same.
CMDA2000 is widely supported because of its first-Mover advantage. It's just that there is no Internet in Japan. (After IP-Mobile crashes)
TD-SCDMA
For example, what is said upstairs is the new standard after the buyout of Datang Telecom, which is relatively easy to transition, but it is not as good as the first two standards in terms of maximum speed.