Why 2G is faster than 1G?

First Generation wireless technology (1G) is the original analog, voice-only cellular telephone standard. 2G stands for the second generation of mobile wireless communication technology, which uses the digital technologies for the mobile communication. It allows slow data communications, but its primary focus is voice.

I think why 2G is faster than 1G because digital voice data can be compressed and multiplexed much more effectively than analog voice encodings through the use of various codecs, allowing more calls to be packed into the same amount of radio bandwith.

Another advantage using 2G are the digital systems were designed to emit less radio power from the handsets, the digital voice encoding allowed digital error checking which could increase sound quality by reducing dynamic and lowering the noise floor, the lower power emissions helped address health concerns, and going all-digital allowed for the introduction of digital data services, such as SMS and email.