3G, EDGE, UMTS, HSDPA: what’s it all mean?

You can always go to Wikipedia — their UMTS article describes it pretty well and there’s even a set of links on the right side of the page that will take you to other standards. Aside from that, here’s an article from a completely different site that, while it talks about Cingular in particular, is still a fairly good intro to UMTS and HSDPA along with their speeds.

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