Smartphone, 4g, 3g, with 2g, the difference between the old machine is as follows:

1, 2G, 3G, 4G network is the biggest difference in the speed of transmission speed is different, 4G network as the latest generation of communications technology, in the transmission speed has a very big improvement, the theoretical speed of the Internet is 50 times the 3G, the actual experience of the experience are also in the 10 times or so, the speed of the Internet can be comparable to the 20M home broadband. 20M home broadband, so the 4G network can have a very smooth speed, watching high-definition movies, big data transmission speed is very fast. The 4G card is the most expensive, and the 2G is the cheapest. Older phones are only good for making calls, not for surfing the web.

2, 2G network era, users can browse some text content on the Internet, open the picture will be delayed, not smooth enough, and 3G era, users can be very smooth to browse the network picture, all kinds of web page news, etc.. The 4G network is even better, watching high-definition movies can be watched in seconds. The coverage of 2G is much higher than 3G, especially in mountainous areas, 4G is gradually improving. The 3G card is less powerful than the 2G, the radiation is also smaller, 4G has been tested radiation is even smaller. 4G is more efficient than 3G in the utilization of the network, which will also bring about savings in power consumption per unit.