What do you mean by 2G, 3G and 4G networks?

2G era: make phone calls, send text messages, send multimedia messages and browse wap pages.

3G era: In addition to the basic functions of 2G, you can also use multimedia Internet access such as video phone, downloading and watching video music, and high-speed Internet access based on app (I only make an outline here, please polish it yourself).

4G era: In addition to the functions of 3G, there are services and applications such as high-definition voice, virtual reality and reality enhancement. (As we have just entered the 3G era and have not fully explored the application of 3G era, it is still not recommended to introduce 4G to ordinary users. Applications such as virtual reality are the foreseeable direction, but it is too early to explain it in detail. )

1G network is an analog network.

The most important thing is not technology or network speed, but application.

4G is faster than 3G, and 3G is faster than 2G.

As long as there are basically smart phones, there is basically no difference in appearance between 2, 3 and 4G cards. The difference lies in the internet speed and the call signal speed.

BTW, 4G is not a rigorous statement. In fact, it has entered NGN, the next generation network starting from 3G. This is a long-term evolution, because the rate is so high that it is no longer necessary to divide it by generations. The so-called' 4G' should refer to a period of development with LTE as the main technical direction, and it has no practical significance like 2G\3G.

The key technical changes are as follows:

1.2G->； 3G？ Multi-user detection, smart antenna, RAKE receiver and diversity technology are introduced.

2.3G-& gt； LTE introduces technologies such as IFDMA and virtual MIMO.