Mobile networks are communication networks where the connection between the end nodes is at least partly wireless. Such a network is generally distributed over the coverage area in the form of cells, where each cell is supported by at least one transceiver or fixed base station. Base stations enable the transmission of useful data to the mobile stations in the form of electromagnetic waves. Each cell uses a different frequency within the given spectrum to avoid interference in communication between the neighboring cells, thus providing highquality information exchange without transmission losses. The popularity of the wireless method of data transmission is due to the telecommunications organizations ETSI and 3GPP which contribute to the development of generations of mobile networks. With the help of various technologies, such as MIMO and beamforming, a higher quality of service is achieved by enabling the simultaneous serving of multiple users via multiple communication channels, greater energy savings and a more resistant system to external interference. With the help of customized sets of protocols and special equipment for the structure of mobile networks, they achieve simple and fast data exchange and access to the Internet and the public telephone network. Wireless communication around the globe would not be possible without mobile networks and a special IMS structure. The IMS structure aims to adapt all protocols of all types of mobile networks and connect all mobile devices, regardless of the type of technology they currently support. Each new generation is more efficient and of better quality than its predecessor. Performance analysis of individual mobile network generations was performed using two mobile devices and the network performance analysis applications. The analysis confirmed the gradual development of mobile networks with each new release. The measured results in the real environment show the increase in the data transfer speed from the oldest network to the newest one, as well as the difference between the actual speeds and the declared maximum speeds.