technically that is not true, I dont care about phone FEATURES, but the communications protocols and standards. The "G" standards have a scope of about 10 years, although they certainly overlap (and the latest generations are in constant flux as they have not been officially standardized).
Rip is correct, the stuff sold as 4G right now, in one way or another, is not truely compliant to what the 4G standard dictates (this is all from my limited understanding).
I have always refrained from owning a cellphone, I think partly because I dont like to own things I dont understand.
I dont know the different between CDMA and GSM, It would be grand to get an overview of the base technologies, when they came about, how they have grown, and how they fit into current and future implementations. I dont so much care for a detailed mathematical explanation complete with equations though, more of a broadly reaching history.