What Does Second Generation Wireless (2G) Mean?

Second generation wireless telephony technology (2G) refers to telecom network technologies that were launched on the Global System for Mobile Communications (GSM) standard in 1991 by Radiolinja in Finland.

Techopedia Explains Second Generation Wireless (2G)

Second generation wireless is a set of standards made for mobile telecommunication which are maintained and described by the International Telecommunication Union (ITU). This technology uses CODEC (compression-decompression) algorithms to compress and multiplex voice data. Because of this technology, 2G can bundle more calls per amount of bandwidth and it offers services like SMS and email. There is error checking and voice quality can be improved by lowering the noise floor.