The recent phones released and unveiled at MWC by Sony Ericsson might have caused a few eyebrows to rise with the deviation in their phone model names. This illustration could explain, well, most of them. The new Sony Ericsson phones will be exhibiting a new nomenclature. Additionally, aside from the upcoming G-series (G for Generation Web), Sony Ericsson will also be releasing an S-series or
Snapshot series, similar to Cybershot except with lower specs, and the R-series or Radio series, which will be the lower end version of the Walkman series.
Original source here