2G and 3G Switch Off refers to the gradual phasing out of 2G and 3G networks by telecommunication companies in favor of newer and more advanced technologies such as 4G and 5G. 2G (Second Generation) and 3G (Third Generation) networks were introduced in the late 1990s and early 2000s respectively, and were primarily used for voice calls and basic data services. However, with the rapid advancements in technology and the increasing demand for high-speed internet, these networks have become outdated and inefficient.