also: にジー
noun
2G; second generation (wireless technology)
Telecommunications term for the second generation of cellular network technology, such as GSM and PDC. Often contrasted with 3G, 4G, and 5G.
この古い携帯は２Ｇしか対応していない。
This old mobile phone only supports 2G.
２Ｇネットワークはすでに多くの国で停波された。
2G networks have already been shut down in many countries.
5G is the fifth generation, the latest standard with ultra-fast speeds and low latency.
Abbreviation of English 'second generation', written as 2G and read as ツージー (from English 'two G') or にジー (using the Japanese numeral に).