2G introduced digital encryption and was the first to offer data services and SMS. 3G succeeded 2G with faster data transfer rates, enabling video calls and being suitable for early smartphones. 4G is the successor to 3G and provides ultra-broadband internet access for mobile devices and laptops, with high data transfer rates suitable for home internet access.

1. 2G, first introduced in 1992, is the second-generation of cellular telephone
technology and the first to use digital encryption of conversations. 2G networks
were the first to offer data services and SMS text messaging, but their data
transfer rates are lower than those of their successors.
3Gnetworks succeed 2G ones, offering faster data transfer rates and are the
first to enable video calls. This makes them especially suitable for use in
modern smartphones, which require constant high-speed internet connection
for many of their applications.
4G is the fourth generation of mobile phone communications standards. It is
a successor of the 3G and provides ultra-broadband internet access for mobile
devices. The high data transfer rates make 4G networks suitable for use in
USB wireless modems for laptops and even home internet access.