The document outlines the evolution of mobile network architectures from 2G to 5G. It describes the key components of 2G, 2.5G, 3G, 4G, and 5G networks. The 2G network included a BSC, BTS, MSC and MS. 2.5G added GPRS capability with an SGSN and GGSN. 3G introduced UMTS with an RNC. 4G networks used LTE with an EPC including MME, S-GW and P-GW. 5G phase 1 used an eNodeB and 5G NR radio. 5G phase 2 added an NGCN core network, while phase 3 removed the EPC.