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1g
First introduced by Nippon Telephone and telegraph to the citizens of Tokyo -
2g
Launched on the Global System for Mobile communications in Finland. -
3g
By NTT DoCoMo, for Japan citizens. -
4g
Introduced for commercial use in Norway. -
5g
South Korea was the 1st country. The 5th generation was rolled out by KT, LG Uplus, and SK Telecom.