1G stands for first generation and 2G stands for second generation are the 2 generations of mobile phones. 1G is that the 1st generation of mobile phones that brought 1st wireless communication to United States. … Difference between 1G and 2G. S.NO1G2G4.The voice signal of 1G is analog signal.While the voice signal of 2G is digital signal.Difference between 1G and 2G – GeeksforGeeks www.geeksforgeeks.org › difference-between-1g-and-2g