The topic of cellular data networks is a rather bewildering
collection of competing and ever-evolving standards as one generation (and
half-generation) succeeds the former and introduces new technologies and services
with new acronyms.
To make matters worse, there’s no single official body that
sets requirements for 2.5G, 3G, 3.5G, or 4G technologies, making it hard to sort
out the differences among competing standards.