What do 2G and 3G in the mobile phone card mean? Do you have 1G? What's the difference between Unicom and Mobile?

These are abbreviations of communication technology in the mobile phone communication industry.

1G (first generation) stands for the first generation of mobile communication technology, a cellular radiotelephone system based on analog technology, such as the analog mobile network that has been eliminated now. The design of 1G wireless system can only transmit voice traffic, which is limited by network capacity. AMPS is a typical example of 1G network.

2G, the abbreviation of the second generation mobile phone communication technical specification, is generally defined as not being able to directly transmit e-mail, software and other information; Only the technical specifications of mobile phone communication are available with calls and some transmissions such as time and date. However, SMS (Short Message Service) can be implemented in some specifications of 2G. 2G is usually called PCs (Personal Communication Service) in America. 2G technology can be basically divided into two types, one is based on TDMA, represented by GSM, and the other is a form of CDMA specification and "﹙Multiplexing﹚".

3G is the third generation mobile communication technology (3G), which refers to the cellular mobile communication technology supporting high-speed data transmission. 3G services can transmit voice and data information at the same time, and the rate is generally above several hundred kbps. 3G refers to a new generation of mobile communication system that combines wireless communication with multimedia communication such as the Internet. At present, 3G has four standards: CDMA2000, WCDMA, TD-SCDMA and WiMAX.

At present, China Unicom and mobile 3G networks are all GSM, and there is no difference. The 3G network standard used by Unicom is WCDMA, and the mobile one is TD-SCDMA.