1G to 2G is analog modulation to digital modulation process. Compared with the first generation of communication, 2G is more mature in technology, has a qualitative leap in system capacity and call quality, and has a greatly enhanced anti-interference capability. And most importantly, 2G networks allow texting and Internet access as well as voice calls. The main network standard of 2G system includes GSM, TDMA and CDMA. 

The second generation of mobile communications can be said to lay the foundation for 3G and 4G, is a solid step in the communications industry. Compared with 2G, 3G mainly expands the spectrum and improves the rate, which is more conducive to the development of network business. At the same time, the evolution of 3G technology combines multiple access methods, USES higher-order modulation technology and coding technology, and USES multi-carrier binding, MIMO and other technologies to further improve the rate.

Under 3G, we have more high-frequency broadband and stable transmission, video telephony and mass data transmission are more common, and mobile communications have more diverse applications. As a result, 3G is also seen as a key to ushering in a new era of mobile communications. 4G has been on our horizon since 2013. 4G technology includes TD-LTE and FDD-LTE, with faster transmission rate, wider network spectrum, higher communication flexibility and better compatibility. All in all, 4G makes mobile phones more versatile. A large and stable flow of information allows you to control both communication and entertainment.

But with the continuous development of technology, consumers have higher requirements for the transmission speed of the network. Whether it's driverless cars or high-definition video downloads, 4G network transmission speeds are still a bit short of the demands of rapid development. At this time, the 5G network with higher transmission rate also comes into being. With the birth and popularization of AR, VR, Internet of Things and other technologies, the demand for mobile network is getting higher and higher. 5G application scenarios are divided into mobile Internet and Internet of things. In addition to solving the development of mobile Internet, 5G's millisecond delay will also solve the demand for wireless communication between machines, effectively promoting the development of Internet of vehicles, industrial Internet and other fields. With the popularization of 5G technology, there will be more interesting applications and new mobile experiences in the future.

In a nutshell, the development of mobile communication will not stop, the evolution of technology will be more and more open. The application of 5G technology is not an end point, but a new starting point. The development of information technology is getting faster and faster, and the amount of data transmission is also increasing exponentially. At the moment, 6G technology has made a breakthrough. In the near future, these technologies are sure to come into our real life and bring great changes to our life. Global mobile communication has gone through the process from scratch and from weak to strong. We also firmly believe that in the development process of mobile communication, we will certainly be able to walk in the forefront of the world and lead the development direction of mobile communication.

First generation of wireless cellular technology and it is based on Advanced Mobile Phone System (AMPS). Aside from the main ability to make a call wirelessly it is flawed in other aspects from performance to security due to poor implementation and technology limitations back then. Few major issues:

2G:

Second generation of wireless cellular technology which is based on Global System for Mobile Communication (GSM). Unlike 1G, it has transitioned from the use of analog signal to digital signal for voice transmission which greatly improves the efficiency on how the audio is being handled. Not just that, with the use of digital signals, users were able to make more than just calls but also text messages (SMS) and picture messages (MMS). 

2.5G:

Further development has created a new revision of 2G as well, known as 2.5G. Unlike the previous generation (2G), bandwidth has improved been from a peak of 64 Kbps to 144 Kbps. This allow more features that can be implemented onto a mobile phone such as sending or receiving email and being able to browse the web.

3G:

Similar to 2G, 3G is based on GSM architecture and in this iteration, developers focused more on improving the bandwidth rate to allow more possibility that could be implemented onto a mobile phone. 3G has different variant as well such as Universal Mobile Telecommunication System (UMTS), CDMA2000 and IMT2000. This time around, 3G has breached the limit of Kbps and it enables data transfer rate of up to 14 Mbps or more by using packet switching. This generation of technology also introduced: video calls, high-speed internet service, TV streaming, and offered better security. Devices that support 3G are often called smart devices as well due to the amount of features it could achieve. With that said, during the early days of deployment, 3G services are expensive and phones that support said technology are scarce too which makes it less accessible to majority of the consumer in the mobile market.

4G:

4G is one of the most commonly use technology nowadays and provide all the features that 3G could offer. In early days of 4G, implementation and deployment of this technology did not achieve the theoretical speed that developers calculated thus, an alternative term has been created which is Long Term Evolution (LTE). LTE uses 4G technology, but this term was used to signify that this technology is under constant update to improve its service until it has reached the peak of 4G’s theoretical capability. In comparison to 3G, 4G offers significantly higher bandwidth rate as well as lower latency so users could utilize the service for service like real-time streaming and large file transfer.

5G:

As technology improves, the amount of data needed to be transferred increased proportionately as well. To accommodate that, 5G was proposed back in 2010s and currently, it has only been deployed in limited selected areas. 5G aims to offer experience similar to a cabled fiber connection speed which is speed of higher than 1Gbps although the current average speed hovers around 300-500Mbps due to multiple factors interfering with 5G signals. With the sheer speed of 5G, streaming ultra-high-definition video on-the-go is possible coupled with large file transfer during work travels (video editing footages, etc) and low-latency interaction with droids (as low as 10ms). 

Conclusion:
As mentioned earlier, technology is constantly being updated. Not just that, data size has seemingly increase in size exponentially as well in order to accommodate or store more information for medium such as video files (8K resolution) or high-definition conference call (with high amount of participants). As such, there is a need for a better technology to assist in achieving said tasks.