"Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the voice itself during a call is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency, typically 150 MHz and up."

...and so let me see...we can say that the 'sooty and sweep' line - see previous notes upon alister baxter at dartington etc etc....is an analog type?...go figure.

https://en.wikipedia.org/wiki/1G