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2G and 3G refer to different generations of mobile telecommunications technology.

1. 2G (2nd Generation): 2G networks were the first to offer digital voice communication and introduced features such as text messaging (SMS). They replaced the earlier analog networks. The most common 2G technologies include GSM (Global System for Mobile Communications) and CDMA (Code Division Multiple Access).
2. 3G (3rd Generation): 3G networks brought significant improvements over 2G, providing higher data transfer rates for mobile internet access. This generation introduced technologies like UMTS (Universal Mobile Telecommunications System) and CDMA2000. With 3G, mobile users could access the internet with faster speeds, enabling better multimedia capabilities.

In summary, the transition from 2G to 3G marked a shift from basic voice and text services to more advanced data services, including mobile internet access. As technology has progressed, subsequent generations like 4G (LTE) and 5G have continued to enhance data speeds, connectivity, and support for a wider range of applications and devices.